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11
PreenFM2 / Re: Frequency
« Last post by Xavier on December 09, 2017, 11:29:51 AM »
Hi,
Even with 16 you'll get into aliasing (noise) very quickly.
It's a frequency multiplier.

If you play a C6 note (~1000Hz) with 16 you'll get 16Khz base frequency.
With all the harmonics brung by the modulation you'll very very quickly reach the limit of the 40Khz sampling rate.

40Khz sr -> frequency above 20K will be folded back bellow 20k and will create kind of digital noise.
That's maybe what you want bu i think 16 is enough for that.

Xavier
12
PreenFM2 / Frequency
« Last post by matrix12x on December 09, 2017, 01:21:15 AM »
Hi,
I was wondering if there was a technical reason the Frequency for the Operators was limited to a maximum of 16 and not 24?
13
PreenFM2 / Re: (compatibility?) questions
« Last post by lensflare on December 01, 2017, 02:38:00 PM »
Thanks Lokki, I have just seen in the manual the possibility to feed the device by USB power line.
so, the solution is really easy!
I will report the battery duration when I will be able to test it ;)
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PreenFM2 / Re: (compatibility?) questions
« Last post by lokki on December 01, 2017, 02:10:01 PM »
simply get a powerpack that you normally use to charge smartphones etc. connect via usb to the preenfm and you should be portable. i have no idea how long the battery will last though :-)
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PreenFM2 / Re: (compatibility?) questions
« Last post by lensflare on December 01, 2017, 10:16:14 AM »
Super, Xavier, thank you VERY much!

so, now it's only a matter to wait the beast to arrive in my studio.
i really cant wait, since the PREENFM is what I was waiting for, a compact, complete, user-friendly FM synth with 6 ops.
and, last but not least, with an EXQUISITE editor (I already surfed in the editor pages and menu, it's awesome in its simplicity).

have you heard about any dyi project to allow PREENFM working with batteries for more outdoor usability?
16
PreenFM2 / Re: (compatibility?) questions
« Last post by Xavier on November 30, 2017, 07:19:23 PM »
Hi,

1) You do that with the preenfm by modifying the MI (modulation indices) between operators.
https://en.wikipedia.org/wiki/Frequency_modulation#Modulation_index
For the carrier operator (lower level, their output is the sound) you modify the MIX parameters.

2) Use the matrix and targets the o[1-6]Fq params. They are the operator 1 to 6 frequency.
Use o*Fq for all at the same time.

3) They both modify the operator frequency. Harmonic is when you want the same number of semitone bellow and above the base frequency.
The other one exists for a longer amount of time in the preenfm2 and is a simpler frequency multipler so you won't have the same interval above and bellow the main frequency.
Harmonic is the typical one to use for pitch bend source.

Xavier
17
PreenFM2 / (compatibility?) questions
« Last post by lensflare on November 30, 2017, 04:06:44 PM »
Hi all,

I am new in the PREENFM world, and just waiting for Van Daal to deliver my brand new white PFM2.

actually, I am programming (fm) synthesis using a (limited) Volca FM.

now, I have just a few questions in order to be prepared when the new baby will arrive in my studio, to start programming quickly:

1) Oscillator amplitude: in the Volce there is a feature to apply an oscillator amplitude modulation (both on Carrier and Modulators) by LFO. is this feature or one similar also in PFM? if yes, which is the name? if not, there is a way to obtain the same result or will be possibily present in a future FW release?

2) Pitch modulation: the same as over: it is possible to modulate the pitch of the carriers  by LFO or by Envelope.
are these features or some similar also in PFM? if yes, which are the names? if not, there is a way to obtain the same result or will be possibily present in a future FW release?

3) which is in the EDITOR the feature "all OP freq harmonic" and its difference respect "all op freq"?

I tried to retrieve these informations in the various manuals, in the website, but unfortunately without success :(

thank you very much for the answers!!! and... EXCELLENT WORK with the PREENFM!!!!
18
PreenFM2 / Re: PreenFM2 SMD version - F1 firmware
« Last post by zelea2 on November 29, 2017, 01:05:26 AM »
I plan to use all the available 4 timers in a round robin scheme  to start a one-shot count when a switch/encoder is pressed and ignore any following presses until the timers elapse. With 4 timers I can keep track of 4 simultaneously pressed switches/encoders.

I've added the timer filtering and 2 new commands to interrogate the F1 firmware date/version and to get a configuration word which says how many audio channels are soldered on the board. Presumably the F1 will be only programmed once when the board is soldered so it makes sense to hold this configuration word.

The code can be compiled now with both CrossStudio and a makefile. I've briefly tested the code on one of those chinese STM32F103 boards and the surface controller code seems to work fine.
19
PreenFM2 / Re: Hiss
« Last post by Xavier on November 28, 2017, 09:38:46 PM »

Try to maximize the bit resolution for your instrument.

Chose the number of voices you need, not more.
Try to set 0 voice to instrument you don't use.

Modify "velo" to see if a lower value improve the result. What it does is the minimal velocity will be higher so the wav bigger and the resolution better.

Xavier

20
PreenFM2 / Re: Yellow OLED : high frequency solution
« Last post by lokki on November 27, 2017, 09:00:00 PM »
yes, that would be ok.
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