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71
PreenFM2 / Re: Latest firmware : 2.10 (2019 june 13th)
« Last post by Xavier on June 25, 2019, 08:03:55 AM »
Hi thanks for the nice words and thanks for the suggestions.

I'm afraid the replies to your questions are :

1. Yes but you can already do that with the scala file (not ideal i agree).
http://www.huygens-fokker.org/scala/scl_format.html
I think someone already made a custom firmware with this. I would need to merge it.

2. I don't think i'll ever do that. But who knows. FM synthesis should not rely on filters ;) even it's it's a good to have.

3. No it's limited by the memory of the preenfm2 which is already full.

4. No, that would be too much work.
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PreenFM2 / Re: Random patch resetting - was yellow oled issue
« Last post by Road_Kill on June 25, 2019, 04:37:47 AM »
Hi Xavier,

I think I might know the issue. I haven't had time to disassemble the synth yet, but I went back to my original post about the bad trace on the r5c board I had to see which pins I had to jump together to complete the damaged path (https://ixox.fr/forum/index.php?topic=63547.msg65848#msg65848). Sure enough, it's pin 6 MCLK on the 405 over to a 74H166. The wire used to effect the repair runs directly under the insulated & grounded plate used for the yellow OLED fix. Maybe I'll go back and find the damaged trace and see if I can bridge it where it's damaged so I can then remove the wire under the OLED shield..? In the mean time, I'm open to any and all suggestions!
73
PreenFM2 / Re: Latest firmware : 2.10 (2019 june 13th)
« Last post by kyoto on June 24, 2019, 09:54:31 PM »
Xavier, thnx very much for your work and great fm maschine ;)

is it possible to build in the firmware new options please:
1) master tune parameter with range for example (428 - 450 Hz)?
2) different types of LP filter (12db/18db/24db)
3) more user waves for operators (now the default is only 6)
4) Do you plan to add to the preenfm2 editor work with banks of sounds and patches?


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PreenFM2 / Re: Latest firmware : 2.10 (2019 june 13th)
« Last post by audiowanderer on June 23, 2019, 01:17:31 PM »
Just checked the latest firmware and goes pretty sweet.
I had some problems saving and accessing via usb cable to the usb stick with the 2.08b and now those problems are gone.
Great job.
75
PreenFM2 / Re: Random patch resetting - was yellow oled issue
« Last post by Xavier on June 23, 2019, 10:54:36 AM »

I never heard of such a problem before.
All that sounds like bad solder joint or shortcut somewhere.

Maybe around the 74H165 and the encoder/button area with the 2 network resistors.
It can also be a ground problem that would make the encoder/button to randomly trigger values and the display not to be stable.

The only solution is to take time with a multimeter and verify carfefully all solder joints.

You can start by checking the voltages of the first schema here :
http://ixox.fr/forum/index.php?topic=63509.msg65602#msg65602

Then use the second one o verify the tracks that start at MCLK, MQH and MLD on the preenf405 to the 74HC165 et resistor network.

Xavier
76
PreenFM2 / Re: Random patch resetting - was yellow oled issue
« Last post by Road_Kill on June 22, 2019, 03:08:03 PM »
FYI - it's currently running OS 2.07. (I've recently moved and my shop and computer are still getting unpacked.) Also, the problem is much more apparent and occurs far faster when midi is being received.
77
PreenFM2 / Random patch resetting - was yellow oled issue
« Last post by Road_Kill on June 22, 2019, 03:05:22 PM »
Greetings! I have a metal cased, R5C PreenFM2 complete with the wonderful Newhouse yellow OLED. I've had the synth for years and it's never worked right. However, what playing I've done has convinced me that this is - or could be - my all time favorite FM synth even with all the newer entries now on market. Alas, I get to working on it, resolve a problem or two, then life causes the work to be sidelined, repeat cycle, and here we are in 2019 and I still want a working Preen! When I first received and assembled the kit, there was a faulty trace that I fixed that was a manufacturing error on some of the r5c's. Shortly there after, I started getting display errors once the synth had been running for a while. Turns out the OLED was running really hot with way too much current draw. While the evidence indicated the OLED was defective from the gitgo, I purchased a replacement. Then the display errors returned, but this time the OLED was running cool and within spec. Flash forward to the present. I have performed the 22ohm resistor/shielding plate modification on the synth and now my display is rock solid and crystal clear...

HOWEVER, now when I run the synth, it will randomly unload/reset/reinitialize any loaded patches I have. For example, if I load a combo, a few seconds later it's changed to Preset 004, 005, and/or 006. Even that isn't stable as sometimes I'll watch a voice occasionally toggle from one value to the next (e.g. Back and forth between Preset 005 and 006). This seems to occur with the same random nature that the OLED display error occurred and has got me wondering if this has been going on the whole time I've had the new OLED, but went undetected because I was fixated on the display errors at the time.

Could this be noise on the USB_DP & USB_DN lines? Anybody else experience this? I'm VERY interested in 'eurofying' my Preen, but I need to get this synth up and running and rock solid first. It's been too long!  :'(

TIA
78
PreenFM2 / Re: New F.M. physical materials tutorial video on Youtube
« Last post by Toltekradiation on June 14, 2019, 11:03:09 AM »
hi NonovYurbiz,
no, i'm not Cevorkum..
to simulate feedback on the pfm2, you can use the different waveforms :
the more feedback, the more harmonics will be added, so for a medium feedback, use the sawtooth waveform, for high feedback, use noise.
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PreenFM2 / Re: New F.M. physical materials tutorial video on Youtube
« Last post by NonovYurbiz on June 14, 2019, 01:11:08 AM »
Hi @Toltekradiation. Are you Cevorkum in YouTube? How do you represent feedback in PreenFM2? Examples in these videos have feedback in one operator. Thanks.

a bump to this underated thread.. :D
thanks you element-s for posting, very nice work, really inspiring !
just found the other videos, i like it all :
https://www.youtube.com/watch?v=dXo_493fEpU
https://www.youtube.com/watch?v=_xL3qr-9-ZE

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PreenFM2 / Re: Programming help: Oscillator feedback?
« Last post by NonovYurbiz on June 14, 2019, 12:23:39 AM »
Thanks. I think I understand the envelopes better now. Will now spend more time on OPs and IMs.
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