Martin_demsky:
> SQ Tracker and Sample Tracker was my main tools in the days of ZX Spectrum (for those who don't know, it was created by people from Czech republic, SQ is shortcut of Scalex and Qjeta (very very good musicians)). I think it was MQM2 demo from MQM team where was for first time showcased capabilities of Sample tracker.
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Yupp - old and classic stuff. 
> but for us musicians it is more important that you can implement 8-bit D/A converter into that port and experience quality of sample playback almost as on Amiga, instead of 4-bit playback on AY chip.
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yes, that's what I meant by "covox" because that's how Russians called it in their 2.1 version (for TR-DOS) although it still uses only 3 channels instead of typical 4ch.
> so i later purchased spanish ZX Spectrum 128k+ with Datel +D disk interface with 3,5" drive and some additional hw, which was zillion times more stable.
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Well, the 2.1 is only for 128K machines - BUT - its final file/module must work on 48K (by design), so it is interesting. And thanx to 128K version of the tracker, it can for instance use many more octaves (even played later on 48K).
irrlichtproject:
> However I don't actually care about sound quality, I'm planning to use it for beeper
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As for the sound quality beeper/AY/covox, those all versions are not different, I think.
However - of course - on beeper You can't really make the trick with delays (two samples with different volume).
On beeper You'd have to play the same sample in 2 channels, and the delay - in one channel only. Then it should work.
