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Topics - Toltekradiation

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preenfm2 and preenfm3 / dfu mode issue
« on: January 11, 2021, 10:48:34 PM »
i have been struggling with the preefm3 build for some time, due to a weird issue :
the dfu mode did not set up when i linked BootD and DFU pins : it seems that the DFU pin does not hold any voltage (on naked board, nothing plugged except usb ) ???
Finally, i linked 3,3v with bootD and could then enter DFU mode and flash the firmware.
It start, the screen seems to work ok, but not the sd card (error #6)
And now, the control board does not act as it should : complete mismatch of buttons and actions.
the 5v pin on left of main board has no voltage as well, there may have some sort of short somewhere, but i can't figure out where  :
the soldering inspection did not give any result (joined two photos of the board, with some voltage values.)

surprisingly, I can play notes and even edit the patch with USB!

Any hints is appreciated...

preenfm2 and preenfm3 / some food for your preenfm
« on: June 18, 2020, 03:15:28 PM »
lately, Nintorac Audio made something great with AI & the dx7 patch archives floating around in the web !

preenfm2 and preenfm3 / Some new hacks
« on: May 07, 2020, 11:08:19 PM »
here is a firmware with two new things :

1. modulators envelopes are now loopable
with a small trick : set release to level 1 and duration to zero, the env will loop A,D,S part of the envelope.
you can emulate a delay fx with this trick ;)

2. start point of the two seq is now usable as destination in the matrix (sq1S and sq2S)
a useful use of this :
set a seq tempo to zero and use a linear note scaling as modulation source of the start point, the seq is now 16 keyboard segment !
i use this to make drum kits..

please find the attached firmware and and drumkit patch example.
cheers !

preenfm2 and preenfm3 / poly glide
« on: March 23, 2020, 09:36:36 PM »
hi all,
i hope you're all well in this strange times :-\

with this extra isolation, i did play a little more with a poly glide attempt (fw attached)
i think it is now quite playable but need to be played to find bugs and improvements ;)
as a bonus, some filters are back and have been reworked
and then there is 3 new matrix destination :
G.hd : glide hold (if >0)
G.rt : glide rate : glide skew (different glide speed for ascending or descending intervals)

(edit: file updated)

preenfm2 and preenfm3 / more matrix sources
« on: January 06, 2020, 08:38:42 PM »
as suggested by @maki, i tried to add some sources in the matrix :

rndK (random on new Key) :
 new random value with each new note

notD (note Difference) :
 difference between current note value and previous one.

velD (velocity Difference) :
 difference between current velocity and previous one.

actv (actives voices) :
% of voices played in current timbre

rpt (repeat) :
at each new note, value increased by by 1/16 if note = previous note, else decrease (min 0, max 1).

dvrg (divergence) :
 value increased by by 1/16 if note different from previous note, else decrease.

that's what i could get with very few code modification and cpu impact.

here is the git commit for those interested :

and then the built file if you want to check it out. :)

preenfm2 and preenfm3 / New filters
« on: August 11, 2019, 12:57:50 AM »
I finally dared to dig the preenfm code, and, it was worth it  8)
here is a firmware attached, that include some more filters :
- lp2 : lp with double filtering
- same for hp2 and bp2
- tilt : adaptation of this :
- allpass : simple allpass filter, need some more work, not sure what to do with this one...
- saturation : this :
- sigmoid : a classic tanh distortion :

I hope you like it!

your ideas and bug report are welcome.

If you want to see the code, here it is :

(edit 2019-09-11 12:45:37 PM : updated attachement)

preenfm2 and preenfm3 / combo 127
« on: May 28, 2019, 11:58:30 AM »
on my pfm2, loading combo 127 just freeze the synth.

preenfm2 and preenfm3 / arp mode change by CC
« on: February 06, 2019, 09:31:58 PM »
I can't change the arp mode with CC 97 on instruments 2,3,4
on instr1, it works, but not as expected : any CC value change the mode to external..
(os 2.09 o)

did i made something wrong ?

preenfm2 and preenfm3 / hang with fast program change
« on: October 29, 2018, 01:34:17 PM »
Hi !
just seen the new os update, thanks for that.
Sorry being too late for the release but i found a bug  :o : I use a digitakt to send program change to the preen, it send very fast program change when turning the encoder, it work fine as long as no bank data is sent from the digitakt. If a bank is defined, it crash quite fast :
PFM2 v2.09 o
LR: 0x0805B019
PC: 0x0807F536
r0: 0x20020004

preenfm2 and preenfm3 / midi out not working (solved)
« on: June 03, 2018, 05:40:32 PM »
hi !
I'm a proud new owner of a preenfm2, I really like it..
thanks for making it happen !

I wanted to let you know about a trouble I encountered about midi out :
in my built I could not get midi out to work, after some head scratching I found that page :

according to that page, the midi out resistors values should not be the same when using 5v or 3.3v -> in the preenfm, the resistor are 220 ohm and should be 47 ohm as the voltage is 3.3v on that zone.
so i tried to put a 220ohm in parallel on the midiout pullup resistor : bingo ! midi out is now seen by my midi interface (edirol UM-2ex) :D

best regards

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