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Old 22 May 2021, 01:21   #1
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Shrinking samples in OpenMPT? (or OSS)

I'm using OpenMPT, though occasionally Octamed SoundStudio..

Is there any way I can reduce the bitrate on a sample but retain the pitch etc? I do it with 8svx samples all the time for sound effects in Audacity, but Audacity doesnt seem to load these protracker samples? I feel like this is probably possible but I can't figure out how to do it.

Some of my instuments are needlessly big, but I thought I should try squashing them before swapping them out for smaller ones!

This tutorials forum section doesnt actually have tutorials in it?

Last edited by Mixel; 22 May 2021 at 02:03.
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Old 24 May 2021, 20:41   #2
J.M.D - Bedroom Musician

Join Date: Apr 2014
Location: los angeles,ca
Posts: 2,130
What seem to work for me - from wav - is the following, however i use milkytracker, but still size might not as reduced as you need; sometimes you might need to go microinstrument to get smaller

1) i use 'resample' in audacity and put 22050 mhz
2) export the sample as 16 bit wav
3) import sample in milkytracker, boost audio (if needed) then change in the instrument tab relative note to C-6 (from the default F-6)
4) use in the sampler option advanced/resample, change the parameters as follows:
Relative note: 0
fine tune: 0
[C-4 speed note will become 8363]
Interpolation: Lagrange

then press OK

lastly change the radio button on the waveform editor to 8-bit and confirm change

I used this method for all samples captured from hoot for the Power Drift soundtrack, result is pretty good
(this is a work in progress so things will be improved, included finetune)

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Last edited by saimon69; 24 May 2021 at 20:50.
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Old 24 May 2021, 21:24   #3
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Ahh! you telling me that stuff about Milky made me realise why I was having such trouble understanding similar functionality in OpenMPT. When I Resample to half Hz, it moved up an octave, that makes TOTAL sense now I understand what's going on. Some of my samples didn't need to be anywhere near as huge as they were, getting it under control now. TY so much.
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