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FM Synth

#1

Hi all,

This is my 1st Cabbage Instrument, would love input or advice from anyone.

There are a couple of things I’d still like to add to it, however, at the moment, the CPU is blowing out after about 30 seconds whenever I play a lot of notes in succession. I’d love any feedback or advice on how to make the code more efficient. I’m neither a coder nor a mathematician, and only a few months new to CSound - so I’m sure I’ve done more than a few silly things here.

FM_TEST_8:12:18.csd (45.7 KB)

#2

Presets please :slight_smile:

#3

FM_TEST_8:12:18.csd (45.9 KB)
FM_TEST_8:12:18.snaps (21.0 KB)

#4

The interface is too big to show on my laptop screen. I’ll try once I have access to a bigger screen.

#5

From what I can see, to make a big improvement in the performance of your code you can do at least two things:

  1. set the ksmps value to 256. That means 5.8ms of lag when you click on a note, that is still perceived as an immediate response by the human brain, but it will decrease the stress very much on your CPU.

  2. get rid of all those if/then/chnset at the end of your instrument:

    if (kalgorithmselect == 5) then
    chnset “outlinecolour(0,128,0)”, “Op2LFOGUI”
    chnset “outlinecolour(0,128,0)”, “Op2GUI”
    chnset “outlinecolour(0,128,0)”, “Op2 EGGUI”
    chnset “outlinecolour(0,128,0)”, “Op2TimeGUI”
    chnset “outlinecolour(0,128,0)”, “Op2CurveGUI”
    chnset “outlinecolour(0,128,0)”, “Op2LevelGUI”
    chnset “trackercolour(128,0,128)”, “LFOMode2RateGUI”
    …
    …

I don’t know for what they are, but if I remove them the max polyphony increases.

Then I think you could try to make many k-time variables in i-time variables, so that they are computed only once.

1 Like
#6
  1. set the ksmps value to 256. That means 5.8ms of lag when you click on a note, that is still perceived as an immediate response by the human brain, but it will decrease the stress very much on your CPU.

Thanks for that, I haven’t had time to work on it the last day - but tried this quickly this afternoon and it made it much more usable! Appreciated.

#8

你好我想问一下csound里面的例子里面的simpleFm synth怎么在白菜里面实现呢谢谢

#9

What simpleFM synth are you referring to?

#13

I’m sorry, Google translate is failing me here. I didn’t write that code, so I can’t really comment…

#14

工程文件是這樣的
Simple_FM_Synth000.csd (23.1 KB)

#15

I didn’t write this code, but I can tell you that it uses standard FM techniques. More details on FM in Csound can be found here:
https://csound-floss.firebaseapp.com/sound-synthesis/frequency-modulation

A very simple FM example, based on this file is attached below.

FMSimple.csd (2.4 KB)

Note that CsoundQT examples use invalue and outvalue opcodes whereas Cabbage use chnget and chnset.

#16

您好，我搜索了此網址，但是顯示其不存在。

#17

Is it not accessible in your country?

#18

應該是

#19

你好，我想知道為什麼把ftgen放進fm裡面没有效果，可以幫忙看看嗎，謝謝。
fm ftgen.csd (6.3 KB)

#20

I think this line is the problem:

massign 0,4 ; send all midi notes to instr 3

I think it should be:

massign 0,2 ; send all midi notes to instr 2

There is no instrument 4 defined. Note also that this line changes the contents of function table 1:

giwave ftgen 1,0, 4096,10, i(gkstr1)*i(kstatus1), i(gkstr2)*i(kstatus2), i(gkstr3)*i(kstatus3)

You define it as a sine wave, but it get overwritten here. So it might be best to use a different table number for the display.

Hope this helps.

#21

你好，我改變後，工程沒有聲音了。fm ftgen.csd (6.3 KB)

#22

Try this one. it works fine for me here.
fmftgen.csd (6.3 KB)

#23

非常感謝你的幫助！

#24

You’re welcome, I guess we should also thank Google translate :slight_smile: