Yes, since you bumped it up, I read the whole thread, and it is indeed very interesting. It touches on some issues I've noticed - and need to explore more - regarding the basic waveforms in the AN1x, particularly their non-standard shapes.
--- In AN1x-list@yahoogroups.com, "karud99" <karud99@...> wrote:
>I want to upload this file I found on my computer, an1x_waves.txt he is talking about in this post of his. The file is now in the Files section of this group.
Whilst I don't know the original synths and thus can't judge how well these settings simulate them, I'm sure other users will appreciate this file.
Like you said, any other files that could be re-uploaded would be nice.
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Some of the non-standard aspects of the waveforms might be due to the fixed analogue LPF on the outputs, which this post seems to suggest has quite a low cutoff:
> 6-12 kHz, a region where many synths already fade out in the power (this includes VA synths, such as AN1x that on 12 kHz is already at -20 dB no matter you applied filter or not).
- Don Solaris at http://www.harmonycentral.com/t5/Keys-Synths-amp-Samplers/AN1x-filters-are-not-correctly-modeled/td-p/9069108/page/3
Surely that is most likely to be due to the reconstruction LPF after the DAC? I'd like to check this. But I don't believe there's any scan of the schematic from which we could derive the critical frequencies of the filter. So, unless I've missed the file somewhere, or someone can scan a copy of the schematic, we'd need someone who knows how to examine the PCB itself and thus figure out the cutoff of the filter.
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Anyway, back to waveforms we go. Although it might have been said elsewhere in the past, I think it's always relevant to point out that the AN1x is perfectly capable of producing sine and triangle waves. The PLG150AN/AN200 advertised these as new features, when they were always available on the AN1x with a little thought and a tiny of of work! All the PLG150AN did was to make them even quicker to dial in.
Sine: Just take any waveform and set its Edge to 0. Voila!
Triangle: Take the square and set its Edge to 64.
That should be a very good starting point, and theoretically is the logical first choice. Of course, to get a particular preferred/characteristic sound, you can also add things like feedback - which I have never investigated yet - and each user's own personal preference as to how much Edge they want, etc.
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I'll do some more investigation of waveforms later, especially incorporating these newly read posts of Richy's that mention feedback and so forth.
As I said, I'd also like to tie that into an investigation of the fixed LPF on the outputs, but I don't believe there's any scanned copy that could help us determine its cutoff frequency, and figuring that out from a PCB is a black art in which I'm not versed. ;)
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Anyone have any thoughts on any of this?