Garvalf:
Aha, OK - I'll get back to You. Weekend, I presume.
> Is it using the beeper or the AY soundchip for outputing the music?
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You can switch it on the SampleTracker. I use AY but people use BEEPER (1-bit) or Covox (8-bit, Amiga quality, but still 3 channels on the SampleTracker, sadly I don't know whether ZX-UNO has Covox implemented. Will check it out too).
Nanode:
Mainly it produces its own sounds (synthetic music). The soundchip is the same what was in Amstrad/Schneider, Atari ST, MSX.
> ZX is sample based?
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It can play 3 channels of samples but it's rather for very lo-fi musicians (it's only 4-bit quality).
Sounds like this -
https://www.youtube.com/watch?v=5QToYfmMygw
Regardssssssssss.