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PreenFM2 / Re: Thoughts about operator tuning
« Last post by lokki on August 12, 2017, 01:06:10 AM »
this is an old topic, but i would like to see this implemented as well!
PreenFM2 / Re: Screen problem
« Last post by lokki on August 11, 2017, 02:01:50 PM »
if you have it opened, i would also check if the mod to remove the high pitched noise is already done. it's an easy thing to do, and in my case it made the screen garbling with MacBook air disappear because the oled used now a little less current.

PreenFM2 / Re: Screen problem
« Last post by Xavier on August 11, 2017, 10:08:07 AM »

If trying another power don't change anything.

You have to open your preenfm2 :
. Try to reinsert the preenF405 and the display.

Still does not work ?
. Resolder the connection points. The header on the display, the header on the PCB and the preenF405 40 pins socket.

PreenFM2 / Re: Screen problem
« Last post by lokki on August 10, 2017, 09:52:49 PM »
how do you power it? from usb or wall wart? i had issues with some usb connectors on my MacBook air not outputting enough current. this gave me a garbled oled output as well.

PreenFM2 / Re: Screen problem
« Last post by smrm on August 10, 2017, 11:16:09 AM »
Hi there thanks for replying. After a few days inactivity I've come back to sort it out so I switched it on and now I get a scrambled screen but with some of the menus there. Then when any button is pressed more gibberish appears. also yes there is still sound. are there any solder points I need to address? it is a diy one but I didn't solder it,bought it second hand.
PreenFM2 / Re: 2 filters in parallel
« Last post by Xavier on August 09, 2017, 11:05:01 AM »

That would require some changes, but why not..
The FX are implemented here :

A solution that should work without modification, is to have all instruments with same preset and listening to the same midi channel.
Set a different filter for each instrument.
You'll get 4 filters in parallel, but with limited polyphony.

PreenFM2 / Re: USB noise - cheap solution!
« Last post by Xavier on August 09, 2017, 10:58:49 AM »

Thanks for the info  :)

When you power with a PSU AND plug the USB to a computer, did you remove the JMP2 jumper ?

Removing the JMP2 will prevent using the power from the USB.
If you leave it you have current from both the PSU and the computer coming in the preenfm2 which must be avoided.

PreenFM2 / 2 filters in parallel
« Last post by lokki on August 08, 2017, 11:18:05 PM »
hi xavier,

would it be possible (codesizewise) to have two filters in parallel (not serial) at the output stage? the second one could just be fixed to bandpass mode. if you set first filter to lowpass and second to bandpass you can get formant vowel sounds, which work well with fm sounds.
PreenFM2 / USB noise - cheap solution!
« Last post by Ilgrazza on August 08, 2017, 09:26:37 PM »

I love my PreenFM2.

I had a slight issue with ground loop noise when using usb power; this is reduced, but not eliminated when using the 9v PSU.  However, I found a cheap solution by accident - the noise disappears when the Preen is connected to the PC via an old KVM switch (£5 from Ebay).
PreenFM2 / Re: Screen problem
« Last post by lokki on August 05, 2017, 02:36:22 PM »
does the synth still produce sound, work as expected (apart from the display issue)?

maybe one of the display solderpoints has come loose. did you solder the synth yourself?
was there some heavy vibration from your jam going on?

just some ideas.

you can also attach a photo of the display here, it might help to identify the issue.
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