“Parts leakage” in Yoshimi (and in ZynAddSubFX)
Ref:
There is a low level signal leak from PARTS signals. Worst case leaking
is audible when using sinus signal synthesis and multiple activated
parts (Sinus voices are great to reveal all kinds of distortions and
intermodulations too):
I have got a HammondB3 style project with 9 sinus signals drawbars
(16’ 8’ 5 1/3’ 4’ 2 2/3’ 2’ 1 3/5’ 1 1/3’ 1’). For years I
found that there is a slight output leakage from all activated Part’s
(small square boxes selected in mixer panel). This leakage is present
only if one or more keys are pressed.
So what, you say? Well: Especially low frequency sinus voices are not
sounding “sinus clean”, but there is an according low level 8 frequency
harmonic content present all the time.
I have got two “Hammond’s”. One is built using two MIDI keyboards and a
PC with Yoshimi softsynth. The other is built using an Arduino to create
MIDI-messages from keys with single switches to PC with Yoshimi softsynth.
The said leakage effect is smaller in my MIDI-keyboards application, but
untolerable in the the Arduino application. Maybe, audio bandwidths are
different? Or??
Checked MIDI levels using aseqdump application, and they is working
correcly 0...127. Checked the Yoshimi “virtual keyboard” instead of the
physical keyboards, and the leakage remained.
Of course, I can play clean sinuses in “instrument presets”, by
activating only used Part’s, but then all the traditional Hammond style
drawbars mixer is lost.
Would there be any idea, how to get rid of this leakage. Yoshimi sinus
voice quality is great, but this harmful leakage makes sinuses “rough”.
Grounding?
redu
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