<div dir="ltr">Hubert Bollig has done a very nice digital emulation of the B3 using a Propeller chip:<div><a href="http://bolltone.de/Projekte/PropB3/PropB3_US.html">http://bolltone.de/Projekte/PropB3/PropB3_US.html</a><br></div><div><br></div><div>He's also done a string synth simulation (but I haven't tried that one yet):</div><div><a href="http://bolltone.de/Projekte/PropString/PropStringUS.html">http://bolltone.de/Projekte/PropString/PropStringUS.html</a><br></div><div><br></div><div>Maybe you could contact him at <a href="mailto:h.bollig@arcor.de">h.bollig@arcor.de</a> to see if he'd share his designs.</div><div>-J. P.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 11, 2017 at 6:51 PM, Michael E Caloroso <span dir="ltr"><<a href="mailto:mec.forumreader@gmail.com" target="_blank">mec.forumreader@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Using info pulled from the AH archives, I emulated the Solina chorus<br>
ensemble effect successfully on my Korg SDD-3300. Square waves from a<br>
top octave combo organ system through a highpass filter (resulting in<br>
a narrow pulse) completes the emulation.<br>
<br>
Variations of that string ensemble effect can result in wonderful<br>
choir ensemble effects.<br>
<br>
MC<br>
<br>
On 2/11/17, bill bigrig <<a href="mailto:billbigrig@yahoo.com">billbigrig@yahoo.com</a>> wrote:<br>
> On the Solina, have you seen or heard about Jurgen Haile triple chorus PCB?<br>
> It would give you some reference if you look it up.Rig<br>
><br>
> On Saturday, February 11, 2017 10:06 AM, "<a href="mailto:sleepy_dog@gmx.de">sleepy_dog@gmx.de</a>"<br>
<div class="HOEnZb"><div class="h5">> <<a href="mailto:sleepy_dog@gmx.de">sleepy_dog@gmx.de</a>> wrote:<br>
><br>
><br>
><br>
> right, but no I won't forget that, it's on the list (and implementation<br>
> ideas) :-)<br>
> And the percussion mode of course, is also on the list. That definitely<br>
> adds some of the sound characteristic.<br>
><br>
> - Steve<br>
><br>
> Am 11.02.2017 um 17:09 schrieb bill bigrig:<br>
><br>
> don't forget key click. Rig<br>
><br>
> On Saturday, February 11, 2017 7:29 AM, Tom Wiltshire<br>
> <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> wrote:<br>
><br>
><br>
><br>
> On 11 Feb 2017, at 14:08, Gordonjcp <<a href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</a>> wrote:<br>
><br>
> > On Sat, Feb 11, 2017 at 11:42:18AM +0000, Tom Wiltshire wrote:<br>
> >><br>
> >> On 11 Feb 2017, at 11:03, Gordonjcp <<a href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</a>> wrote:<br>
> >><br>
> >>> What you absolutely must do is ensure that all the notes you generate<br>
> start in phase.<br>
> >> <snip><br>
> >>> This is something you'd need to do on a tonewheel emulation, too.<br>
> >><br>
> >><br>
> >> Why? The Hammond tone generator is free-running and the pitches are fed<br>
> straight to the busbars. While the frequencies themselves might have a fixed<br>
> phase relationship, it's not related to note onset in any way.<br>
> >><br>
> >> Or am I misunderstanding what you meant?<br>
> >><br>
> ><br>
> > Okay, pull out the 8' bar and play C3. Holding that down, play C4, on<br>
> and off a few times. You'll hear it key on and off, great.<br>
> ><br>
> > Now pull out the 4' bar as well, and play C4 again. What's the phase<br>
> relationship between the fundamental of C4 and the 4' stop of C3? Can you<br>
> see a situation where you might end up with the two cancelling?<br>
> ><br>
> > If you were generating all 91 tones, you'd just be gating them on and<br>
> off. But in a typical software synth you'd generate each voice individually<br>
> with fixed polyphony. If you're not careful with it you could easily end up<br>
> with some notes out of phase with others and odd random shifts in tone<br>
> colour as a result.<br>
><br>
> Aaah! Yes, ok, absolutely! I see what you mean. Thanks Gordon.<br>
><br>
> This is a very good point he's making - since the Hammond uses the same<br>
> tone generator for every/any note, there's no danger of phase cancellation.<br>
> The same is true in the TOG organs/synths. Any "voice based" implementation<br>
> needs to ensure that it copies this effect. This isn't too difficult if all<br>
> the voices are produced on the same DSP, but it makes processor-per-voice<br>
> implementations a bit awkward to do.<br>
><br>
> I'd be inclined to run NCOs simulating the correct Hammond pitches for the<br>
> driving/driven gear combinations, and then use shifted versions of the phase<br>
> accumulator to generate the waveform indexes for the required number of<br>
> octaves. With only a dozen notes, that's not a lot of work.<br>
> To adjust the pitches for the standard TOG division frequencies would then<br>
> be a case of tweaking the twelve frequency increments.<br>
><br>
> Tom<br>
><br>
><br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> Synth-diy mailing list<br>
> <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>
> <a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/<wbr>listinfo/synth-diy</a><br>
><br>
><br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> Synth-diy mailing list<br>
> <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>
> <a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/<wbr>listinfo/synth-diy</a><br>
><br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> Synth-diy mailing list<br>
> <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>
> <a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/<wbr>listinfo/synth-diy</a><br>
><br>
><br>
><br>
<br>
______________________________<wbr>_________________<br>
Synth-diy mailing list<br>
<a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>
<a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/<wbr>listinfo/synth-diy</a><br>
</div></div></blockquote></div><br></div>