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Messages - lokki

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106
would be highly appreciated! this makes me crazy...

107
and the last message :-)

i can confirm this happens with ableton live sending notes to preenfm2 as well! i created a fast run of notes (multiple times the same note, and also different notes) and when i send it to preenfm2 over usb, i get the same stuck note 0. the notes have to be pretty short to trigger the behaviour. so it could also be that only very short notes trigger the fault.

108
just writing down my findings, sorry for all the messages.

i tried the same controller with a waldorf pulse and i cannot get any stuck notes from it. so it seems to be an issue with the preenfm. xavier, can you see any reason how very fast runs of notes could get a stuck note with midi pitch 0? i never send a value 0, but when i send a note off with pitch 0 from ableton, the note is released correctly, so it must be midi note 0 that is stuck...

109
PreenFM2 / Re: aftertouch bug? (or general modulation)
« on: July 15, 2016, 09:57:39 AM »
ok, getting a little further. it seems to be a very low stuck note. when i adjust gliding in a monophonic patch, every note glides from below. i disabled aftertouch on the controller and it is still happening. so i am now thinking it is more a very fast run of notes that somehow triggers this low note. if i send a note off from ableton live with c-2 value (midi note 0)  the problem disappears. will look further into this issue. maybe it is my controller that is somehow sending note 0 values, but i doubt it.

110
hi there,

when i modulate im* via aftertouch, after a while i can hear a zippering noise from the preenfm2 even when i don't play a note. applying aftertouch without hitting a note (yes i can do that with my controller) varies that noise. at that point also my modulation wheel (set to op* freq in the matrix) is able to change this noise...

has anyone seen/heard this behaviour? i'm on 2.03. this only happens after a while of playing and after extensive use of aftertouch (a lot of data).

111
PreenFM2 / Re: Modulation Matrix
« on: July 12, 2016, 12:09:08 AM »
thats what FM is...

well technically that's what AM is...

112
PreenFM2 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 11:30:32 AM »
xavier, how high would the samplerate of the adc with your firmware approximately be? could we also theoretically input audio-rate signals?

cheers

113
PreenFM2 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 10:45:45 AM »
yep. so i will try to come up with something and post the schematic. i will use it with 0-5v signals, but the general principle will be the same.

114
PreenFM2 / Re: preenFM is going to Eurorack
« on: July 09, 2016, 12:30:25 AM »
yep, maybe. so basically we just need to scale the 0-10v control voltage to 0-3.3v and you open the ports and add support for the analog input in the matrix?

this would be super awesome! scaling the cv should not be hard.

115
PreenFM2 / Re: Yellow OLED : high frequency solution
« on: July 08, 2016, 11:31:30 PM »
ok, thanks for the clarification. strange, it does not look darker at all! surely perfectly useable for my purposes.

the aluminium shield / resistor mod combo works wonders, thanks for this simple fix! i put 128 layers of aluminium between the display and the pcb and i cannot see (or hear) any spike in voxengo span. this is with the internal input (gain maxed out) on a macbook pro. with 64 layers i could still see a small spike.

116
PreenFM2 / Re: Hello, new to the board :) / High frequency parasite?
« on: July 08, 2016, 10:03:03 PM »

I did find one solution that works 100%: plug the PreenFM through a passive D.I. with GND Lift. Like this I have a regular background noise, there might be this frequency a bit stronger (when you know it), but it's more than reasonably quiet!


this makes sense, but it essentially cuts all frequencies above/around 15 kHz and higher since passive d.i. tend to roll off highs anyways. (the audio goes through a transformer, hence you can insulate it completely)


117
PreenFM2 / Re: Yellow OLED : high frequency solution
« on: July 08, 2016, 04:52:36 PM »
hi xavier,

i put a 68ohm instead of 22ohm in there, is it also ok? everything seems to work, so i thought i ask why exactly you choose the 22ohm value? (brightness maybe?)

also note that this "mod" cures my problem with power feeding from the macbook air (if you remember). so it seems the display was the current hungry thing that made the macbook air struggle.

cheers

118
PreenFM2 / Re: cerb40 flashing
« on: August 04, 2015, 03:01:48 PM »
just to bring this up since i had the same problem...

it does not have to be bad soldering. if you have hooked up the preenfm2 to a usb port for power, try a different computer.

when i had hooked up my preenfm2 to a macbook air, i got flaky display issues (writing from right to left, only row one and three, nothing, scrolling text all over the display...) i soldered headers again and checked continuity with the multimeter. the issue stayed. at one point i switched the usb connector to my macbook pro, and voila! it worked perfectly! seems the macbook air had not enough "current" for the preenfm2....

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