1651
preenfm2 and preenfm3 / Re: preenfm2 Editor (nothing ready yet)
« on: June 27, 2014, 11:11:19 AM »Will share a Work in progress hopefully soon
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Will share a Work in progress hopefully soon
1652
preenfm2 and preenfm3 / Re: Patch Randomiser
« on: June 27, 2014, 11:10:44 AM »Usefull thread, thanks all.
I don't have much free time currently, but I'll first finish the Editor then back to firmware with the randomizer as high priority.
Xavier
1653
preenfm2 and preenfm3 / Re: Stm32F4Discovery port
« on: June 27, 2014, 11:08:25 AM »Great project
I'm glad to see open source code is usefull to others.
Did you fork the github project ? Don't forget to share your changes
And thanks Patrick for the very accurate answers....
Xavier
1654
preenfm2 and preenfm3 / Re: preenfm2 Editor (nothing ready yet)
« on: June 24, 2014, 09:16:32 PM »1. Thanks
2. Yes, but could be done in the pfm2 firmware directly.
Final question : I'm afraid it won't work with ableton live. Editor <=> preenfm2 communication is 100% NRPN.
Xavier
1655
preenfm2 and preenfm3 / Re: Built a new one :)
« on: June 24, 2014, 09:11:33 PM »
Hi Mike,
Here is a quick picture i just made.
Let me know if that helps.
If you can take picture of both your jack and PCB with the header and a close view of the area around the optocoupler.
A wrong diode direction would also prevent the Midi in to work.
Xavier
Here is a quick picture i just made.
Let me know if that helps.
If you can take picture of both your jack and PCB with the header and a close view of the area around the optocoupler.
A wrong diode direction would also prevent the Midi in to work.
Xavier
1656
preenfm2 and preenfm3 / Re: Patch Randomiser
« on: June 23, 2014, 10:15:50 AM »The mb6582 has an interesting implementation- you can choose which sections to randomize, like oscs, modulations, filter, seq etc. Would be interesting if a similar approach was adapted to the preen engine, and would be a good solution to the unusable outcome problem.
That sounds like a great idea. Thanks...
1657
preenfm2 and preenfm3 / Re: Patch Randomiser
« on: June 22, 2014, 08:45:22 PM »Seems like i'll have to work on that one day.
Could be written internally also.
But it's not obvious.
As 6581punk said, pure random would lead to 99.9% of unusable sound.
Xavier
1658
preenfm2 and preenfm3 / Re: preenfm2 Editor (nothing ready yet)
« on: June 18, 2014, 09:13:47 PM »Thanks i'll give a try.
1659
preenfm2 and preenfm3 / Re: operator feedback
« on: June 18, 2014, 09:13:23 PM »At the end of the compilation you get a memory dump.
The following lines are interesting :
[ 3] .data PROGBITS 20000000 050000 002a8c 00 WA 0 0 8
[ 4] .jcr PROGBITS 20002a8c 052a8c 000004 00 WA 0 0 4
[ 5] .bss NOBITS 20002a90 062a90 0085fc 00 WA 0 0 4
[ 6] .ccm PROGBITS 10000000 058000 0090e8 00 WA 0 0 4
[ 7] .ccmnoload NOBITS 100090e8 0610e8 006074 00 WA 0 0 4
10000000 is CCM (64kb)
20000000 is regular mem (112kb)
After the adress, first value is offset the second one is size.
CCM :
We have 0090e8 + 006074 = 61788 bytes out of 65536.
The descending execution stack starts at the top of this memory, so we can consider it's full.
Standard memory:
002a8c + 000004 + 0085fc = 45196.
So yes there's free RAM here for new waveforms
Are there any other good sites or books to read about coding in C for music applications such as the PreenFM2? Are there any differences when coding for an ARM vs the ATMega?
...
Also, to remove the DC offset created by operator feedback, would we subtract the mean from the signal?
I don't think there's book for coding music applications in C. There is C/C++ on one side and understand how a synth work on the other one.
Then there are lots of information on the web to link both sides.
To remove DC use a simple HP filter.
You can have a look here :
https://github.com/Ixox/preenFM2/blob/master/src/synth/Voice.cpp#L2952
And line 2967 and 2987.
I filter freq4 to remove DC.
Xavier
1660
preenfm2 and preenfm3 / Re: operator feedback
« on: June 17, 2014, 09:34:49 AM »
The second part here is good :
http://www.musicdsp.org/showone.php?id=160
Replace "PM is better that FM" by "PM is different...."
"(with PM)... cascaded carrier-modulator pairs and feedback modulation are possible."
I added LP filter for cascaeded operators to get rid of the constant frequency value (pitch shifting).
For feedback we should do the same.
Xavier
http://www.musicdsp.org/showone.php?id=160
Replace "PM is better that FM" by "PM is different...."
"(with PM)... cascaded carrier-modulator pairs and feedback modulation are possible."
I added LP filter for cascaeded operators to get rid of the constant frequency value (pitch shifting).
For feedback we should do the same.
Xavier
1661
preenfm2 and preenfm3 / Re: Midi sequencing Problem
« on: June 16, 2014, 04:17:59 PM »Thanks Kuzma for your feedback, good to know.
1662
preenfm2 and preenfm3 / Re: [Sold out] preenfm2 white metal case
« on: June 16, 2014, 03:43:55 PM »Yes, a new run will start very soon, metal case alone will be available in August.
1663
preenfm2 and preenfm3 / Re: Midi sequencing Problem
« on: June 15, 2014, 11:28:34 PM »
An other idea :
Have you checked the midi channels the octatrack sends to ?
By default the 4 preenfm2 instruments listen to channel 1, 2, 3 and 4.
That can be changed in the menu.
You can change the 1st instrumnet to listen to ALL channel, to see what happens then.
Xavier
Have you checked the midi channels the octatrack sends to ?
By default the 4 preenfm2 instruments listen to channel 1, 2, 3 and 4.
That can be changed in the menu.
You can change the 1st instrumnet to listen to ALL channel, to see what happens then.
Xavier
1664
preenfm2 and preenfm3 / Re: LEDs when building with the metal case.
« on: June 15, 2014, 11:13:29 PM »Great, thanks for the nice words
1665
preenfm2 and preenfm3 / Re: Midi sequencing Problem
« on: June 15, 2014, 11:13:10 PM »Hello,
What do you trig from the sequencer ? midi note on ?
The numbers shows up when the preenfm2 receive midi note on... So if you send CC for example, you won't hear anything and won't see anything.
Have you checked sending the same sequence to another sound module ?
Or even better to a midi monitor program on your computer ? That would allow you to understand exactly what the octatrack sends.
Let me know what you find,
Xavier