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PreenFM2 / Re: PreenFM2 stopped working..
« Last post by lokki on January 08, 2018, 10:45:54 PM »
try only pluggin in the headphones after startup. also try not to insert the stereocable fully, leave it a little out so that both channels connect to the mono output (you will get sound on both headphones)

i remember having this problem also sometimes when i had the headphones fully plugged in (could not find a pattern)
PreenFM2 / PreenFM2 stopped working.. (solved.. Thanx to Lokki)
« Last post by opus.quatre on January 08, 2018, 09:49:12 PM »
Hello there..
My preenFM2 was working ok the last time I used it.. that might have been in june.. Then I parked it for a while, and took it again today.. And when I plugged an USB cable, running from my computer to the preen, I had a short flash of the blue LED, as usual, and a series of squares on my LCD screen.. I plugged earphones on one output, just like I had done before, and tried pressing INST and one of the buttons on the left, but had no sound in my ears..
So of course I need help..
Have a nice evening or day, or even both..
PreenFM2 / Re: Problem starting PreenFM2
« Last post by lokki on January 08, 2018, 09:36:21 PM »
what happens when you are in bootloader mode and access the usb stick via pc/mac? is the stick recognized by the pc/mac? can you move/delete/create files/folders?

what do you see on normal startup on the display? where does it freeze?
PreenFM2 / Problem starting PreenFM2
« Last post by memorysplice on January 08, 2018, 05:38:48 PM »
Hi  I am having issues booting from USB stick.  It will load into bootloader, but will not load into the synth.  I have tried to reformat the drive I have tried to use a different usb stick.  I have tried to reflash the bootloader.  I have checked the connections on the usb port.  I do not know what to do next.
PreenFM2 / Re: custom extended firmware
« Last post by lokki on January 07, 2018, 11:10:19 PM »
and here is the "standard" firmware with all the additions mentioned in the above post. have fun!

PreenFM2 / Re: custom extended firmware
« Last post by lokki on January 07, 2018, 05:02:06 PM »
here is a new extended firmware with the following additions

this is the 8timbres version (8 mono instruments), not the normal 4timbres version. a 4timbres version will follow.


*global tune:
tune your preenfm reference a from 435 to 444 hz, finally you can play with classical musicians :-)

*constant value as modsource: a constant value as modsource allows you to offset any moddestination. i use it to offset some instruments by one or two octaves...

still in this firmware, as seen before :-)

usercc: choose a midi cc from 0 to 126 and use it as a modsource
program change mod: choose what program change does on the preenfm: preset change, combochange, dx7 bank...

PreenFM2 / Re: PCB ready
« Last post by zelea2 on January 07, 2018, 08:59:08 AM »
I did get an great deal. 37$ delivered for 10 PCB (green mask only). I could have got a stainless steel stencil for just another 13$. Crazy prices from EasyEDA.

After a quiet period I'm back. My boards arrived in the post 42 days after I've ordered them. I was hoping to get them before XMAS so I can do some work over the break but no luck. It took EasyEDA 25 days to manufacture them and another 17 days to get them shipped. This was the first time I've used them and I am not very happy about this delay. In the past I've used "ITEAD Studio" "Seeed Studio" and "Dirty PCBs" which were also cheap and I've received boards in about 3 weeks time instead of 6. This time I've cheapened  and got EasyEDA  as the first entry from . Lesson learned not to use them again unless I don't care about the delivery time.

Anyways I have 10pcs now and by the end of this week I plan to solder and run my test programs on one. To test the functionality I will just use 4 encoders to generate sine waves with all the piano notes on all 4 output channels.
PreenFM2 / Re: custom extended firmware
« Last post by lokki on January 06, 2018, 10:59:20 AM »
see here:

 (since 2.08 changelog is on GitHub)
PreenFM2 / Re: custom extended firmware
« Last post by stelpa on January 06, 2018, 10:32:09 AM »
hi stelpa,

what features were you hoping for?

global midi channel and hertz mode already are in 2.08.

program change mod would be easy to readd, EDIT: a quick try with usercc failed since xavier changed somethings in that regard...
USERCC is readded, easy enough :-)
that being said, i'm working on some new extensions, currently on the 8timbres branch. will be easy to remerge into the standard firmware.

features coming:

-global tune (tune the preenfm from 435 to 444 hertz)
-constant value for the matrix which enables you to transpose instruments by applying a constant to o*fq...
-program change mod is still there :-)

Oh, I didn't realize those features had been added to 2.08, they weren't mentioned in the changelog I don't think. That's awesome! I'd love if USERCC was re-added, and global tune sounds very nice, but I think I'll use the 2.08a version in the meantime - I was mostly looking for hertz mode, so that's good to know that it's still there. Thanks Lokki :)
PreenFM2 / Re: midi offset and EDIT: globaltune...
« Last post by lokki on January 06, 2018, 09:49:09 AM »

how do i check if i have global tune selected in the menu?

so that i don't call the Osc::tune function all the time when i am in the menu.

in other words i'm trying to do something like this:

Code: [Select]
if (selectedMenu == MIDICONFIG_GLOBAL_TUNE) {

i don't fully understand because the place you gave me in code (line 1029 in SynthState.cpp) is for encoder 3 (the one i am turning to adjust the value) how do i check the position of the first encoder? (since i assume this corresponds to MIDIONFIG_GLOBAL_TUNE) hmm...

EDIT: to clarify, a version without the if-statement works perfectly well, but i thought it is bad practice to call the function even when other settings are changed...
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