Hi,
Yes, here’s my current version. I use some samples for percussion sounds, and disabled those to enable the csd to run.
If you enter your own samples on line 80-84, and enable the sample player on line 442-450, it should work as it does here.
Mainly it is intended to work with midi in and out, so I do not use the synthesis in Csound for this one.
I haven’t written any proper documentation, so here is a brief rundown of what it does:
When you play a midi note, it will generate the LSYS from that base pitch. If you hold the note longer than the time it takes to generate all branches, it will start over, looping the tree again and again.
Also, if you play another note simultaneously, it will force the new branches to the symbol represented by the (absolute) interval between the notes. For example if you play a C, and while holding the C you play a C#, the interval is 1 semitone and all branches in new generations will be forced to use the symbol A. Similarly, it will use the symbol B for an interval of 2 (playing D as the second not in the example above).
You can set the melodic interval for each symbol in the GUI, and also the rules (a separate text box for each root symbol, e.g. in “rule A” you can set to generated symbols for A. Use capital letters here, and only letters A,B,C,D at the moment.
Each generation is output on a separate midi channel, and there is an option to create a percussion track from one of the generations (set in “perc_gen” in the GUI). The percussion track maps symbols to note numbers as set in “drum map” in the GUI.
Rhythm is calculated by dividing the available time into how many symbols it branches out to at each point. This way, some complex nested rhythms are generated. To my ears it sounds a bit like “instant Zappa” 
Hope you find it of some use
Øyvind
fre. 14. mars 2025 kl. 20:30 skrev Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie>:
Fun that you should ask… I was working on a midi-controllable Lsys generator in Csound today.
I have been using the,m in the past, but never got around to really making anything with them. I do include them in my digital composition class, though, and this year actually several of the students picked up the ideas. Then I thought I’d look once more for myself too
The midi controllable one is very much an odd attempt and needs much refining. I’ll share when it is presentable.
I attach two examples I have used in class that just shows a possible way to implement them in pure Csound. I use recursive instrument calls to produce each generation. That is a little bit messy, but perhaps you find it useful
Øyvind
Thanks Øyvind for your files!
I did not work that much with strings yet in Csound, so it was very interesting to see your approach. Did you find a solution for MIDI controlable LSYS?
Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here
Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
lsys_cs_midi_nosamples.csd (15.7 KB)