G2 sample playback.

ian-s · Last edited by ian-s on Sat Feb 15, 2014 12:52 pm; edited 1 time in total

link

Chrome or Firefox only, get latest if not sure. Works almost on IE10 but link wont save so useless.

Here we go. Alpha 0.1 of online audio sample to pch2 creator. Still a bit rough sorry.

Use the choose file button to select .bin, .wav, .aif(f) files. The program will accept uncompressed 8 bit bin files but has no way of telling because they don't have a header. Many available on the net have the ROM type code like 2716 included in the file name so the program assumes anything with 27 somewhere in the file name is not a-law compressed. If a wave looks wrong, try adding 27 to the filename. While the uncompressed .bin files work, they are only 8 bit originally so wont sound as good as the a-law DX roms.

When a file is loaded, it’s wave is displayed twice. Original and 2:1 compressed. A scale indicates how much of the wave will fit into a single G2 variation. Use the other scale buttons to change to other ratios. The last selected ratio will be how the wave is saved to the G2.
Add up to 8 files. You can go back to view other waves by clicking on its row in the table but I haven’t implemented delete or replace yet.

When happy with your set, click the Get PCH2 button and download your pch2 file.

ian-s · Posted: Sat Feb 15, 2014 12:46 pm Post subject:

To do list:

Put name bars into pch to record filenames and ratios.

Write names etc to textpad: done

ian-s · Posted: Sat Feb 15, 2014 5:14 pm Post subject:

Please feel free to report any issues or make comments here.

The AIFF format file header records the sample rate as an 80bit extended floating point number so I don't know if my code will report correctly > 48K.

You should probably downsample in a wave editor if you have any very high sample rate files anyway.

The decimation in my code uses a very basic FIR.

Hopefully Tim will come up with a higher resolution sample patch with frequency shifting and I can tweak the code to work with it.

Lfohead · Posted: Sat Feb 15, 2014 7:48 pm Post subject:

Nice! will have a look soon Smile

anigbrowl · Posted: Sun Feb 16, 2014 3:29 pm Post subject:

Most interesting. I just did a quick test on one file so far but the results were very positive. Particularly interested to see that you plan to implement MIDI files.

ZeeByeZon · Posted: Mon Feb 17, 2014 3:51 am Post subject:

Great work !
Will it be possible to download the app to run it without internet connection?

I tried it quickly and I think it would be better to normalize the wave before converting to pch. I had some example where the sound is much too low.

ian-s · Posted: Mon Feb 17, 2014 4:11 am Post subject:

ZeeByeZon · Posted: Mon Feb 17, 2014 10:08 am Post subject:

In fact I meant the volume is too low, some wav samples may not use the full dynamic range and in such cases, the volume should be raised.
This needs a first pass to measure the maximum amplitude in the sound file, then a second pass to apply a gain to each sample.

ian-s · Posted: Mon Feb 17, 2014 11:29 am Post subject:

xav · Posted: Mon Feb 17, 2014 4:44 pm Post subject:

That seems like a sample converter for G2... is it possible?
Incredible!

ian-s · Posted: Sat Feb 22, 2014 12:13 am Post subject:

Just uploaded a significant update. Same link as op.

The app now uses the hi res dual pair of sequencers and utilities the FX area so you still have the same number of patches and sample time.

The sample start trimmer is shorter to reflect the higher sample rate. The name of files that you use and their time scale is recorded in the text pad area for future reference.

I have attached a sample performance to indicate how to trigger the samples. I had planned on allowing you to span more than one variation with a single sample but am having some trouble getting the triggering to work. If you click on the span cell in the table, the number will increase by one and the system will split the file across that number of slots. Be careful, I haven't implemented any bounds checks so if the total of all the spans > 8 you might crash the app. I mention it only in case someone wants to have a go at getting the multi-var trigger working.

The sample prf2 has an extra seguencer to compensate for a 32nd note timing issue I haven't tracked down yet.

new prf.prf2

Description:

just to show how you might trigger one of these sample patches.
Triggering likely to change in future versions.

Download

Filename:

new prf.prf2

Filesize:

28.97 KB

Downloaded:

3725 Time(s)

ian-s · Posted: Sun Feb 23, 2014 11:58 pm Post subject:

Just published the version with midi>pch2 function ported from the other app. This version uses a new template that contains 80bars and has the option of setting individual tracks to SlotA-D (or off).

There is a compromise for the extra bars, each variation now has 10 bars which doesn't allow repeating sets of bars multiple times. I should allow for selection of a more 4:4 friendly template in a future version.

Here is an example (muss_7.mid again sorry) but at least the entire thing fits in this time at 4*higher timing resolution.

m7.prf2

Description:

The whole promenade in higher res, + a little bit of the next...
THe prf2 shows how to chain variations with 10 bars each.

Download

Filename:

m7.prf2

Filesize:

49.84 KB

Downloaded:

3774 Time(s)

urbanspaceman · Joined: Feb 26, 2008 Posts: 77 Location: italy

hi, i tried on chrome and ff on linux with no success..
any idea?

The code is opensource?
i'm a web developer and i'm interested on the code side

ian-s · Posted: Wed Mar 19, 2014 11:27 am Post subject: