FM synthesis

kisielk · 2017-11-11T22:17:56.834Z

This is amazing FM7 was always one of my favourite ugens in Supercollider, but this is taking it to a whole other level.

Galapagoose · 2017-11-12T00:04:09.731Z

vals:

you can find it here

http://camil.music.illinois.edu/Classes/404A2/2/truax.pdf

This link is dead for me - anyone have a repost?

dansimco · 2017-11-13T23:45:02.893Z

Awesome work! Came to this thread to share this after it turned up on hackernews today. Can’t wait to have a dig with it later on.

zebra · 2017-11-15T01:50:09.506Z

this is amazing work! kudos!! it sounds great.

hope you don’t mind, but i forked the project on github and started making modifications:
[ https://github.com/catfact/DX7-Supercollider ]

so far i’ve just refactored the script into a class so you can easily make multiple instances* and manipulate them a little more cleanly, like so:

s = Server.default;
s.boot;
s.waitForBoot { Routine {
	x = DX7Clone.new(s);
	x.note(42, 90, 10002);
	12.wait;
	x.note(42, 0);
}.play; };

next i’d like to fix issue with auto-freeing the synth with DetectSilence. (i think a HPF before DetectSilence will do it; if there are big DC components that get clicked off, oh well.) for now i just extended the max note length from 10s to 24h

also planning to optimize some stuff like the data file usage.

(*) ok, multiple instances are still a little bugged ATM…

cmcavoy · 2017-12-05T20:08:19.737Z

Couple of analog FM questions - I currently have three VCO’s (a Makenoise DPO and a MN STO), which I enjoy FM’ing. I’ve discovered many interesting sounds, many difficult sounds. All in all, analog FM is a theme of my rack.

Based on notes from @zebra above, I started looking at through-zero VCO’s. Any big through-zero fans that can give me a read on whether or not a through-zero VCO like the Doepfer A-110-4 or A-110-6 would be worth adding to the mix? Through-zero seems like it would up by analog fm game significantly…are those two modules good options? Any other through-zero options I should consider?

Edited: Looks like Intellijel Rubicon also does through-zero, not in my price range though.

simondemeule · 2017-12-05T22:35:20.376Z

chapelierfou:

This thread is simply amazing, and gave me an idea for Teletype : a new “HZ” table that would allow CV out to refer to a “relative” frequency based on the 1v/Oct standard.

Or, the ability to have fractional/floating point values for the N table ? (not sure how/if it could work).

Anyway, the goal is to easily produce frequencies that share some fractional proportion.

I’ve been wanting something similar for navigating harmony/generating scales using ratios, and it looks like we’re both in luck! 2.2 should bring us a working ratio to voltage conversion operator, as described here.

LLK · 2018-01-26T07:02:44.662Z

Sooooo in order to avoid the GAS inducing “let’s create a new topic for every NAMM annoucement” effect, I’m just bumping this thread with the recent reveal of Elektron’s take on FM synthesis for the FM lovers / curios out here, any thoughts about it?

Synthtopia – 26 Jan 18

Elektron Digitone Designed To Make FM Synthesis User-Friendly

Elektron today introduced the Digitone, a polyphonic digital synthesizer that features what they call ‘a powerful yet user-friendly take on FM synthesis’.

sam · 2018-01-26T07:36:28.663Z

You could probably make a new thread… my reasoning being…

It doesn’t actually mention FM synthesis on the front panel, rather it’s called a “Polyphonic Digital Synthesizer”. My expectation is that they would like to add other forms of synthesis into it, they probably don’t want to promise things that don’t exist at launch.

The block diagram on page 13 of the manual makes it even more explicit by referring to the FM block as the ‘audio engine’, I guess one should look to the Monomachine for ideas.

Back to the subject of FM, appendix A in the manual goes into a bit of depth on how they’ve structure their FM implementation. You don’t seem to get full control of each of the 4 operators, which is not to say that the controls have been dumbed down.

LLK · 2018-01-26T08:04:03.034Z

I’m a bit scared about the “new thread per gear” logic, for stuff that isn’t even out yet and everything, I don’t know, feels kinda wrong to me and I think that here, the added value clearly seems to be the FM engine so I thought it would interesting to add it to this thread (other option, and that’s the beauty of not creating a thread especially for it : we’ll also be able to discuss it in the “polysynth” thread when people will start having it ^^)

papernoise · 2018-01-26T08:05:49.817Z

sam:

It doesn’t actually mention FM synthesis on the front panel, rather it’s called a “Polyphonic Digital Synthesizer

Elektron explicitly market this as an FM synth. Though of course that doesn’t mean it really is one, but it still feels like this kind of fits in this discussion anyway.

abalone · 2018-01-26T23:41:04.917Z

@LLK
namm show anaheim
maybe it could go here, too
fm synthesis

GAS haiku thread Equipment

don’t buy helmet-cam! longboarding is dangerous, just practice stopping.

rishabh · 2018-01-27T17:29:46.108Z

There’s a book by Dr. John Chowning on Understanding FM Synthesis. There was a PDF floating around but I can’y seem to find that link anymore. Anyone have access to that eBook?

Thanks.

anon45924993 · 2018-01-27T17:32:26.201Z

@zebra linked to it in post #41 of this thread

FM synthesis Equipment

yeah but a doubling isn’t enough. (it would be for AM.) each modulation point adds equally spaced sidebands at multiples of the modulation index (sorry, frequency), out to infinity i think. (negative-frequency sidebands are reflected though 0, which gives you the “chorusing” effects.) the amplitudes of the sidebands is a bessel function of the first kind, with mod index as argument. sorry its just a google away, but this looks like a good walkthrough of the math using snd (and lisp!) https://c…

rishabh · 2018-01-27T17:35:12.151Z

Thanks, I saw that one. But I was referring to another book. It was an actual book but out of print now. There is a PDF version of that. Its called Understanding FM Synthesis, or something on those lines.

rishabh · 2018-01-27T17:36:31.377Z

OK, I just found it. I was completely wrong about the title. FM Theory & Applications, By Musicians for Musicians. http://www.loscha.com/scans/FM_Synthesis-Theory_Applications.pdf

AlessandroBonino · 2018-01-29T05:24:16.236Z

I was a bit meh on the Digitone until I saw this video. Now I am quite interested. Looks really well thought out.

joshhh · 2018-01-29T19:46:26.635Z

The Digitone looks like the most intuitive hardware FM synth I’ve seen, which is a pleasant surprise given that “intuitive” isn’t a word I would use to describe my personal experience with Elektron gear thus far.

GijsW · 2018-02-12T19:18:46.117Z

If you’re into modular, find “akemie’s castle” on YouTube. That one looks pretty damn intuitive too.

madeofoak · 2018-02-28T18:35:44.711Z

andrew huang put up what i think is the easiest to understand explanation of FM the other day, thought y’all might enjoy it:

Heath · 2018-02-28T19:53:08.522Z

My favorite FM synth I’ve had was the DX1. Probably followed by the FS1R. I was also a huge fan of the Preen FM module