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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
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 Posted: Wed Mar 08, 2006 5:50 am Post subject:
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A cleaned up version of the 303 frame...
It still has the quirky slide section..maybe i do a even more stripped version...
Its only important to have it this way to transfer lines from a real 303..of cause it would be possible to do any kind of seq array aslong we have a gate time..slide activation...accent activation and of cause pitch information.
This is called a frame to allow to keep soundengines and sequencers as seperated modules to develop something that has a max performance factor
while still having resources on the G2 left...
I also include a maxed version of the 303 sequencer that allows aswell 303 style writing with pitch mode and real time note insert aswell as having a step seqencer for pitches that can be shifted in time or reversed and punched into the main pitch sequence...
Even when this extra functions allow faster sequence creating and experimentation they are way too expensiv to have live a decent polyphony left for other tasks than 303 emulation...
Therefore i think the big version is a sequence development tool while the small one is for performance versions of the patch...
Its possible to parameter paste info between the main seuqencers.
still try to avoid the real work in rebuilding the soundengine 
and as a last add beforer going to the real questions..
The 303 frame 05 with the big sequencer ...for the lazy ones 
Btw:
the information about boosting LF on accented notes appears to be accurat and important.
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303 Frame 0.5.prf2 |
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G203Seq V6.1.pch2 |
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Last edited by 3phase on Wed Mar 08, 2006 4:56 pm; edited 1 time in total |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 8:11 am Post subject:
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And one more of the real background infos to master this challenge...
this 3 audiofiles show impact of the accent to the filter.
again a devilfish that allows settings that are not possible with the standard 303.
Waveforms before filter look close to what they should be..exept that the sqare is far from perfect and is varying in pw over the tone range of the 303.
Filter knob is full up... saw...no resonance... no env mod...
gatetime one quarter note
no accent and full accent and full accent with long decay...
its interesting that is the long acc decay note the event is longer than the gatetime...
how is that possible?...
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saw FltUpNoMod.wav |
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SawAccNoEnvMod.wav |
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SawAccNoModLngAccDec.wav |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 9:05 am Post subject:
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And one more...
this time waveforms directly out of the filter...
filter gets overdriven by the devilfishs booster
one saw
one square with resonance... resonace in medium-up setting
note with the saw that the waveform gets more to its ment shape (freqresponse?) when the filter is driven harder.
with the square the resonance disapperas when the filter gets driven harder..
what does that tell us???
if anybody has any ideas that might be translatable into patching...please add to this thread.
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overdrive saw after filt.mp3 |
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overdrive filter SQres.mp3 |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Wed Mar 08, 2006 3:39 pm Post subject:
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| 3phase wrote: | its interesting that is the long acc decay note the event is longer than the gatetime...
how is that possible?... |
The 303 mod env is fixed to 200ms for accented notes, devilfish adds a pot so you can have long accent decay. When accent signal is on, mod env is routed via accent amount pot to both vcf and vca. I think.
On the 303, the accent signal is only connected to two CMOS switches. The first routes the mod env to the top of the accent level pot, the second shorts out (or disables) the env.decay pot, forcing the decay time to minimum (200ms). |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 4:40 pm Post subject:
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hmmm..looks like...and this is an important detail..
because all statements are against the present of the mod envelope to the vca control.
this might be the part that adds lowend to accented notes as the guy with the impulse responses was stating...
I think its important to uncover this little things...
they sum up to the difference that made the 303 allways better than the clone attempts.
Especially the response to the accents is one of the points where clones usually loose against the original...it just dont sounds as sexy as with a real 303
btw: thanks  your input is very welcome
Even when most people think the 303 is a lame item...
The difficulty patching it shows thats not yet fully discovered.
A pro one was easy to patch... I wonder if Sheridan is still around ..
He was/is brilliant in modelling natural sounds.. I wonder how he would do a 303... But he would also just get the static moment...without the real structure you never will cover the range of possible sounds of a 303...
and this is the special magic about the machine... allmost any knobsetting is usefull and directly communicates with the others... |
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
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G2 patch files: 626
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| Posted: Wed Mar 08, 2006 5:10 pm Post subject:
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Yes its definitely connected to the VCA, through R119, R120 and D27. Also the wiper of the resonance pot that feeds back into the filter is also summed into the VCA input, so with increase resonance, amount of filter to vca increases.
Your sample posts are interesting, a lot more clipping on the saw than I expected. It is almost half wave rectified. They also show time constant of resonance lag on env.mod.
The mod env decay curve, as it effects Filter is expo but not quite. Interaction between the shape of the basic env and the (very simplistic) expo converter on the filter. It seems to morph from expo to linear over time. |
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dasz
Joined: Oct 16, 2004
Posts: 1644
Location: victoria, canada
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| Posted: Wed Mar 08, 2006 5:13 pm Post subject:
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3phase, I can't wait to hear your 303 emulations ... RedOne will be unpacked tonight !!!
/Dasz |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 5:18 pm Post subject:
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| g2ian wrote: | Yes its definitely connected to the VCA, through R119, R120 and D27. Also the wiper of the resonance pot that feeds back into the filter is also summed into the VCA input, so with increase resonance, amount of filter to vca increases.
Your sample posts are interesting, a lot more clipping on the saw than I expected. It is almost half wave rectified. They also show time constant of resonance lag on env.mod.
The mod env decay curve, as it effects Filter is expo but not quite. Interaction between the shape of the basic env and the (very simplistic) expo converter on the filter. It seems to morph from expo two linear over time. |
huhh.. i see, you see a lot
does that say that we have increasing impact of the resonating filter signal on the amplitude modulation of the vca?
And other question..because thats where i am just working at...
the last audio sample of the full resonating filter with accent sweep action..
what do you think about that? usually the filters i know dont let pass much signal when they are resonating so heavy...
in this example it sounds like having the original wave without resonance upfront..sounds like to seperated signals to me...
any ideas how this is caused? cant beliefe that roland spend for 2 independent filters... |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 5:26 pm Post subject:
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| dasz wrote: | 3phase, I can't wait to hear your 303 emulations ... RedOne will be unpacked tonight !!!
/Dasz |
I havent posted a new emulation try yet...just the frame and a few starting steps... i havent reached the state of modelling the sound yet..
still collecting informations..with results
just the enevelop with dynamic decay time and the lowend boost can bring it much further to exitement.. and i dont know yet how the things G2ian is suggesting might work. Its good to be able to verify this against the real 303 next to me...that is sadly no devil fish...everything what makes it closer is correct.. Therefore result of the last days..
The lowend needs to be boosted an accented notes..its defenetly happening on the 303...you just dont realize because its rather subtile but gives the accents more 3d presence.. next version will feature that..
And Ians add shows me a better way than crossfading between eq´s..
this is never part of a real 303...that the lacking mod envelope has a different freq response / less lowcut than the direct signal seems much more likely to me.. I ve to try it ..
Its necessary to get the complete picture before i start and than finetuning based on a wrong model again...
The 2004 version had the problem that tuning in one direction was loosing on another...a proof that the structure was wrong.
Last edited by 3phase on Wed Mar 08, 2006 5:39 pm; edited 1 time in total |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
G2 patch files: 141
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| Posted: Wed Mar 08, 2006 5:33 pm Post subject:
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| g2ian wrote: | | Your sample posts are interesting, a lot more clipping on the saw than I expected. It is almost half wave rectified. |
do you think this is clipping? i was overdriving the filter far beyond this can happen on a 303 and the waveform actually got in shape.
in my earlier emulation attempts i had the same waveform just by filtering..lowcut and mid boost around 450 hz was part of it...
So i was thinking that the funny waveform is more a result of unlinear amplification..
is it possible that certain circuits that bend the freq response get a flatter response when driven hard? |
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Wed Mar 08, 2006 5:42 pm Post subject:
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| 3phase wrote: | does that say that we have increasing impact of the resonating filter signal on the amplitude modulation of the vca?
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No, the first gang on the resonance pot (the one that controlls the amount of feedback to the inverting input of the filter) is also connected to the VCA audio input (R121,C21)in parallel to the normal vcf -> vca connection. This compensates for the bottom end loss of the moog ladder at high resonance. Also might explain that last sample.
I see both vca inputs go through a cap which might explain the HPF look to the basic waveforms. |
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ian-s
Joined: Apr 01, 2004
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Location: Auckland, New Zealand
Audio files: 42
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| Posted: Thu Mar 09, 2006 3:14 am Post subject:
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| 3phase wrote: | do you think this is clipping? i was overdriving the filter far beyond this can happen on a 303 and the waveform actually got in shape.
in my earlier emulation attempts i had the same waveform just by filtering..lowcut and mid boost around 450 hz was part of it...
So i was thinking that the funny waveform is more a result of unlinear amplification..
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Yes your right, just low cut or HPF makes that shape. It matches other real 303 samples I have. |
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8BitVertigo
Joined: Dec 23, 2004
Posts: 14
Location: MD USA
G2 patch files: 11
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| Posted: Thu Mar 09, 2006 5:09 am Post subject:
303 Model |
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Guys - I'm travelling for the next week - can't wait to hear how far you guys get in that time.
The patches I posted cut the VCA to close to 200ms on accents, but I think there is some interaction on slides above 200ms - I could be wrong.
There are some brilliant minds out there, I'm sure collectively we can get close to the real thing - unfortunately I don't have the money for the real thing - so the samples are really useful.
Happy patching 
8Bit |
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cebec
Joined: Apr 19, 2004
Posts: 1098
Location: Virginia
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| Posted: Thu Mar 09, 2006 8:56 am Post subject:
Re: New 303 model |
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| 8BitVertigo wrote: | 3 phase
Have a go on this one - I haven't tried to start from scratch, but this sounds pretty good. I remodelled the filter (borrowed heavily from a filter Rob Hordjik had posted) and smoothed out the accent sweep envelope. There's a couple of variations to play with, screams something along the lines of the real thing.
Let me know what you think. |
this one truly walks like a duck and quacks like a duck!
most fun i've had tweaking a 303 emulation in years... that sound!!  |
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8BitVertigo
Joined: Dec 23, 2004
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Location: MD USA
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| Posted: Thu Mar 09, 2006 9:01 am Post subject:
303 Emulation |
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| I've had a few late nights myself - hours lost tweaking this one as well.....kind of wish I had the real thing but keep telling myself these magic red boxes must be capable of getting close....... |
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ian-s
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
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| Posted: Thu Mar 09, 2006 7:00 pm Post subject:
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The envelope sounds indeed more like it than just a plain one..
I will try it ...want to do some experiments now with
the enevelope and the negative offset...
i wonder if the envelope for the filter mod might be reversed in control voltage? i ve to cut more audio examples... but its interesting that increasing envelope depth on accented notes, the ones with the highest filter mod..only lowers the frequencie the filter falls to...
The only thing that makes the filter go even higher is the accent sweep circuit...
I just got a printed service manual...shit...2:30 allready here...a bit late to start patching...but i think its my turn again to post one version
the filter looks shit complicated..this two traces to the vca from the filter......
when the resonace is off one of them goes to ground while when its up booth traces are like one... the value of the coupling caps doubles this way..
is that only for that reason? puhhh... what a miracle box... |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
Audio files: 13
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| Posted: Fri Mar 17, 2006 10:35 pm Post subject:
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Ok ..i try to give it some more research today..but in the moment i doubt that i really have the time to get thru with this... Threfore i post a few more important audio snippets that show what is going on and might help others that are in research of the item.
The behaviour of the EnvMod Knob of the 303 is the most important.
As i stated before the unique point about this envelope mod is that it sounds somehow very ruberish... I thought the decay times get longer when its up..
But by analyzing this audio samples its even more complicated...
As more up the EnvMod pot is the lower the frequencie gets the env falls to.
This indeed has the fx that depper modulations appear to have a longer decay... as you can see with the samples its almost twice as long...
But..Close to the max position the filter frequencie the envelope falls to gets so low that the decay shortens again....
Explains pretty good why the EnvMod knob on clones appears to be somehow dead in relation to what is going on on a real 303...
I ve to experiment with this again now.. I am still a bit curious if the envmod knob really just gives a negativ offset...Or if this is rather a function to the envelope that reacts dynamic during the sweep...
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EnvAmntReso.mp3 |
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EnvAmntMore3.wav |
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EnvAmntMax.wav |
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ian-s
Joined: Apr 01, 2004
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Location: Auckland, New Zealand
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| Posted: Sat Mar 18, 2006 12:20 am Post subject:
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| What position is the env.mod pot in at the start of the high resonance sample? |
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3phase
Joined: Jul 27, 2004
Posts: 1189
Location: Berlin
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| Posted: Sat Mar 18, 2006 4:56 am Post subject:
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Just a little bit up like in a real 303 where allways is a little env mod.
the recording is directly after the filter.
In the beginning of the source recording the sound starts with no modulation at all... |
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X-Electric
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3phase
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3phase
Joined: Jul 27, 2004
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8BitVertigo
Joined: Dec 23, 2004
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