Pfm2 : unison discussion

[solipsvs]

are there cc left to assign? maybe matrix destinations?

[matrix12x]

@ solipsvs are you suggesting using a CC or a mod destination for unison detune.

[solipsvs]

indeed! but i also posted about an amplitude ratio parameter of ‘fundamental (not detuned) to unison layers’.  perhaps it would be appropriate?

also the spread doesnt seem to do anything

[matrix12x]

On my unit "spread" seems to affect the stereo field. I've mostly been doing unison using 3 or 4 voices max.

Looking at the code, it definitely effects the pan.
for example in Timbre.cpp:
float opPanInc = 2.0f / numberOfCarrierOp * params.engine2.unisonSpread;


Regarding the amplitude ratio, sounds like a cool idea. Might you have a sound example from another synth?

[solipsvs]

thats not hard to imagine?  it adjusts the volume ratio between the fundamental and detuned layers.

[Xavier]

Detune is only calculated when a new note is pressed.
So it would not work in the matrix.

Spread works for me too.

another thing that might be nice is a volume balance between the fundamental note frequency and the rest of the unison layers...  has a way of allowing unison to just flavor the effect rather than be full strength only...  there is room for one more knob!

Actually no. Or not as easy as it seems.  But for technical reason.
The preenfm2 as a strong link between what you see  and what parameter is stored.
And at the free knob position there is the version of the preset that is stored.
That would requires a bit more work.

[solipsvs]

ah well, unison is a massive improvement so it was successful.  can you tie parameters to cc tho?

[vurt]

Tried the latest unison version, it sounds really great.

Something else seems to have changed too since a tiny few of my patches now has a terrible overdrive sound, which was fixed by turning down the internal volume. Really odd kind of distortion because if you play for a bit you notice some sounds comes out without any kind of distortion and the next note is distorted beyond belief lol

[Xavier]

Tried the latest unison version, it sounds really great.

Something else seems to have changed too since a tiny few of my patches now has a terrible overdrive sound, which was fixed by turning down the internal volume. Really odd kind of distortion because if you play for a bit you notice some sounds comes out without any kind of distortion and the next note is distorted beyond belief lol

Do you mean distortion when you enable Unison ?
Or distortion on your old mono presets ?

[Xavier]

ah well, unison is a massive improvement so it was successful.  can you tie parameters to cc tho?

Yes i'll add that.

[solipsvs]

fanks bruv.

[vurt]

Do you mean distortion when you enable Unison ?
Or distortion on your old mono presets ?

Mono. Filters off. it's perhaps 30% of my patches that are affected and needs lower volume to not distort.

[Xavier]

Mono. Filters off. it's perhaps 30% of my patches that are affected and needs lower volume to not distort.

Ouch...
With filters OFF
OK so that's a regression. I have to understand what's wrong.
Could you share a preset that is impacted ?

[vurt]

Mono. Filters off. it's perhaps 30% of my patches that are affected and needs lower volume to not distort.

Ouch...
With filters OFF
OK so that's a regression. I have to understand what's wrong.
Could you share a preset that is impacted ?

sure. i also checked to see if it was my own waveforms making it too loud, but no (i have one that is super loud, much louder than the default square).. i think i have your email so i should be able to send you a patch later.

edit: sent. I only used presets which uses the default waveforms.

[matrix12x]

@vurt do the patches that distort use a particular algorithm? Also does the volume knob have to be at full, or does it also distort on less than max?

Are the patches short envelope times or long envelopes (like a pad)?

I run my PFM2 at maybe 3/4 max volume. I have not noticed any distortion. but maybe I just lucked out.