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 Forum index » DIY Hardware and Software
"Ensemble" effect circuit similar to Roland VP-330 vocoder?
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electrospeaker



Joined: Jun 30, 2006
Posts: 16

PostPosted: Sat Mar 15, 2014 7:25 pm    Post subject: "Ensemble" effect circuit similar to Roland VP-330 vocoder? Reply with quote  Mark this post and the followings unread

I'm in the process of building a rack-vocoder, and having previously owned a Roland VP-330 vocoder I really want to incorporate that "ensemble" (chorus) effect as IMHO it made half the vocoder sound.
It should be small enough to fit inside the vocoder's 19" rack enclosure and I can do fine with just a few preset settings (as opposed to multiple adjusting potmeters which there won't be any room for anyway).
As I'm not an engineer but more of a practical hobbyist I can't design it myself, so it should be a circuit board I can order, a functioning circuit layout Eagle etc. file (which I can make a PCB from), a kit or even a ready made board.

The best solution would be a clone of the VP-330 ensemble section but I haven't found that yet. I did however find the Oakley stereo ensemble project which seems very cool, but too big and with too many knobs for my use.
I read somewhere that the Roland RS-505 Paraphonic keyboard uses the same ensemble section as the VP-330 which in turn is based on the Roland Dimension D chorus effect unit (there's a Dimension-D clone available from TB-audio gear but it's a bit on the pricey side and I can probably do with a simpler unit.
I've also read comments about how the Boss Dimension-C pedal (Boss DC-2) and Boss DC-3 works wonders. Behringer's CC300 pedal has also been suggested -possibly a clone of one of the Boss pedals.

I don't have any experience with any of the above so any suggestions are very welcome.
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StephenGiles



Joined: Apr 17, 2006
Posts: 481
Location: England

PostPosted: Sun Mar 16, 2014 5:48 am    Post subject: Reply with quote  Mark this post and the followings unread

The sample on the Oakely site is brilliant, using chords to demo the chorus sounds - unlike those on Youtube for the Buchla 297 Infinite Phaser which use sequenced staccato sounds and demo nothing at all!!
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AndyR1960



Joined: Feb 16, 2007
Posts: 281
Location: Manchester UK
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PostPosted: Wed Mar 19, 2014 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread

You could get a second hand Boss SE70… The "Wave Chorus" algorithm is the one you want as it gives a perfect 3 phase chorus effect, just like the VP and other stringers.

The annoying thing is, that I recently completed JH's Triple Chorus not realising that I had access to the same rich ensemble effect in the SE70 that's been languishing at the back of my cupboard for the past 10 years Rolling Eyes
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electrospeaker



Joined: Jun 30, 2006
Posts: 16

PostPosted: Thu Apr 03, 2014 4:38 am    Post subject: Reply with quote  Mark this post and the followings unread

So your digital SE-70 chorus setting sounds similar to the analog Jürgen Haible Triple chorus?

I've located both the Roland VP-330 vocoder and RS-505 Paraphonic service manuals online which contain the schematics, but as I'm not competent enough to design my own stuff from that I was hoping someone else had beat me to it. I just heard an RS-505 demo on Youtube and its ensemble sounds more powerful (and versatile with its 3 settings) than the VP-330, but I guess either (or other similar ones) will make a huge difference in the vocoder anyway.
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AndyR1960



Joined: Feb 16, 2007
Posts: 281
Location: Manchester UK
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PostPosted: Thu Apr 03, 2014 9:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I've just taken a look at the VP & RS schematics - The VP ensemble FX has two delay modulation circuits, one fast and one slow, quite basic from what I can see.

The RS on the other hand has 4 delays (one more stage than most ensemble effects), which would account for the richer effect.

The SE-70 is a Boss/Roland unit, and now that I know about it, I'm not surprised they incorporated that particular chorus algorithm - it's very nice, as you can use 2 or 3 mod LFO's. I just wish I'd stumbled across it sooner. Rolling Eyes
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