Topics

1

preenfm2 and preenfm3 / Inconsistent sound with certain algorithms [Fixed in 2.09]

« on: September 30, 2018, 01:53:41 PM »

Hi!

When I use  algorithms with stacked modulators, e.g. alg1, alg5 or alg11 which all contain the chain Op3->Op2->Op1, I experience a random change in the tone colour between consecutive strokes of the same key.

My patch is very simple:

• Start e.g. with alg1, velo=0, voice=6
• set op1 and 2 to sin, keyb, freq=1.00, ftun=0.00; op3=off
• set a "gate profile" for op1 and op2 envelopes, i.e. lv=1.00 for Attk,Deca,Sust, Release lv=0.00, all times=0.00
• all matrix routing off (I used srce=none)
• Modulation IM1=2.00, v=0.00, all other modulation off
• arp and filter both off

If I now play a note, I get a slightly different tone everytime I press a key. I see this in a spectrum analyser where most of the time the amplitude of the carrier frequency is smaller than that of the first sideband c+m (and even the second c+2m), but sometimes also the carrier is the strongest component. This changes in tone colour are also audible.

I get the same behaviour with different algos, as long as they contain op2->op1 and op2 is the destination of another operator, e.g. alg5 or alg11.

To be absolutely clear here: When I play and hold a single note, this one note is perfectly stable, no change in its spectrum at all.
But when I release the key and then hit it again, then I obtain a different spectrum than before. The change is sometimes smaller, sometimes larger, in an apparently random way.

At first I thought perhaps this is how FM works in this particular situation, but...:

• Since my patch use only two ops, I went to alg3 where op2 is not the destination of another modulator and voilà: no more change in spectrum, everything is perfectly stable! The same for other algos with op2->op1 and op2 not destination of some other op
• When I stay with alg1 and now turn on op3=sin, keyb, freq=2.00, ftun=0, op3 env="gate" as for op1 and op2, and IM2=1.00. Then I also get a changing spectrum as described above. (Only this time perhaps the differences are bigger) Again the situation is identical for alg5 or alg11.

So this is probably a bug?

2

preenfm2 and preenfm3 / Default combo does not respect release time setting [Fixed in 2.09]

« on: September 30, 2018, 10:19:18 AM »

Hi!

I noticed that when the default combo is loaded at boot time, the release time parameter of Instrument 1, Operator 1 is not affected. It always starts at a value of 2.56 after boot.

My goal was to have a kind of clean init patch after boot with just a pure sine wave and simple gate for all envelopes, i.e.,

Attk lv   Deca lv   Sust lv   Rele lv     
0.00 1.00 0.00 1.00 0.00 1.00 0.00 0.00

But when I make these setting, do menu->Save->Defl->Save, and then reboot, the release time is again at 2.56. All other params are loaded ok from the defl combo.