# How to add release time when stopping a sound **URL:** \ **Category:** General\ **Created:** [April 29, 2023, 11:46am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199 "2023-04-29T11:46:00Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [April 29, 2023, 11:46am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/1 "2023-04-29T11:46:00Z")
I am trying to make a simple keyboard that plays SoundFont sounds on unity. Since Csound is new to me, I created the following as a test. ```csound instr PlayOrStop kStart chnget "start" if changed(kStart) == 1 then event "i", "SoundFont", 0, -1, gkNote, gkVel endif kStop chnget "stop" if changed(kStop) == 1 then event "i", "SoundFont", 0, 0, gkNote, 0 endif endin instr SoundFont mididefault 60, p3 midinoteonkey p4, p5 inum init p4 ivel init p5 ivel init ivel/127 kamp linsegr 1, 1, 1, 0.5, 0 ;envelope kamp = kamp/3000 kfreq init 1 a1,a2 sfplay3 ivel, inum, kamp*ivel, kfreq, 0 outs a1, a2 endin ``` When you press PlaySound, the sound is played, StopSound will stop the sound. The problem is that when I press StopSound, the sound immediately disappears and the release time that I should have set in SoundFont does not work. (Of course, this is because the vericity is zero.) For example, what event should I issue to make the sound release over 0.5 seconds? Thanks in advance. ---
**Author:** ![g\_b](https://forum.csound.com/user_avatar/forum.csound.com/g_b/32/208_2.png) [@g\_b](https://forum.csound.com/u/g_b)\ **Post date:** [April 30, 2023, 12:18am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/2 "2023-04-30T00:18:35Z")
Hi @KANIYO and welcome to the forum. Try having a look at one of the ‘r’ opcodes like: [https://csound.com/docs/manual/linenr.html](https://csound.com/docs/manual/linenr.html) or [https://csound.com/docs/manual/linsegr.html](https://csound.com/docs/manual/linsegr.html) ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [April 30, 2023, 1:26pm UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/3 "2023-04-30T13:26:08Z")
Thanks for the quick answer!!! I read the page you linked to. I am trying to avoid issuing midi events as I am planning to eventually import them into Unity (iOS). This is because I do not know how to loop back Midi events on Unity (iOS). What I want to build is a simple piano. It should play a sound when a finger touches the keys, and the sound disappears when the finger leaves the keys. I have already included `linsegr`. I have tried changing some values but it doesn’t seem to work… ```csound kamp linsegr 1, 1, 1, 0.5, 0 ;envelope ``` I would be very happy if you could give me some more details. Thanks in advance. ---
**Author:** ![g\_b](https://forum.csound.com/user_avatar/forum.csound.com/g_b/32/208_2.png) [@g\_b](https://forum.csound.com/u/g_b)\ **Post date:** [April 30, 2023, 4:00pm UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/4 "2023-04-30T16:00:44Z")
Hehe sorry it was late and I didn’t notice you were already using _linsegr_. I think the issue lies in the _event_ opcode, that doesn’t check for release segments. Try this (using _turnoff2_): ```csound instr PlayOrStop kStart, kval cabbageGetValue "start" insno nstrnum "SoundFont" if changed(kStart) == 1 then event "i", "SoundFont", 0, -1, gkNote, gkVel endif kStop chnget "stop" if changed(kStop) == 1 then turnoff2 k(insno), 0, 1 ;event "i", "SoundFont", 0, 0, gkNote, 0 endif endin ``` ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [May 1, 2023, 7:56am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/5 "2023-05-01T07:56:05Z")
Thanks for your cooperation. But I just can’t get it to work. The sound didn’t stop. Here is my code. What am I doing wrong … ```csound form caption("TITLE") size(200,200), guiMode("queue") pluginId("def1") button bounds(30, 20, 80, 40) channel("start") text("PlaySound") button bounds(30, 100, 80, 40) channel("stop") text("StopSound") -n -d sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ;load a soundfont prints "------------LOAD SF--------------\n" strset 1, "88KeysMultiTonesPiano.sf2" isf sfload 1 sfplist isf sfpassign 0, isf gkNote init 60 gkVel init 100 instr PlayOrStop kStart, kval cabbageGetValue "start" insno nstrnum "SoundFont" if changed(kStart) == 1 then event "i", "SoundFont", 0, -1, gkNote, gkVel endif kStop chnget "stop" if changed(kStop) == 1 then turnoff2 k(insno), 0, 1 ;event "i", "SoundFont", 0, 0, gkNote, 0 endif endin instr SoundFont prints "HELLO\n" mididefault 60, p3 midinoteonkey p4, p5 inum init p4 ivel init p5 ivel init ivel/127 ;make velocity dependen kamp linsegr 1, 1, 1, 17, 0 ;envelope kamp = kamp/3000 ;scale amplitude kfreq init 1 ;do not change freq from sf a1,a2 sfplay3 ivel, inum, kamp*ivel, kfreq, 0 ;preset index = 0 outs a1, a2 endin f0 z i "PlayOrStop" 0 z ``` ---
**Author:** ![tarmo](https://forum.csound.com/letter_avatar_proxy/v4/letter/t/c37758/32.png) [@tarmo](https://forum.csound.com/u/tarmo)\ **Post date:** [May 1, 2023, 9:09am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/6 "2023-05-01T09:09:04Z")
Hi ! Try to add printk2 kStop to see how it actually behaves. Tarmo E, 1. mai 2023 11:06 KANIYO via The Csound Community \<[noreply@forum.csound.com](mailto:noreply@forum.csound.com)\> kirjutas: ---
**Author:** ![g\_b](https://forum.csound.com/user_avatar/forum.csound.com/g_b/32/208_2.png) [@g\_b](https://forum.csound.com/u/g_b)\ **Post date:** [May 1, 2023, 10:27am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/7 "2023-05-01T10:27:52Z")
Inside the SoundFont instrument, the time it takes for the sound to fade out after the release is set to 17 seconds! Try this: ``` ;kres linsegr starting value, duration of first segment, value after first segment, duration of release segment, ending value kamp linsegr 1, 1, 1, 0.3, 0 ;envelope ``` So here the sound starts with an amplitude of 1, after 1 second amplitude is still 1, and when released, after 0.3 seconds, amplitude is 0. Also I noticed I made you use _cabbageGetValue_, which won’t work on Unity. Sorry for that, my brain is on holiday!! 🤦‍♂️ Use chnget as you were doing already: ``` instr PlayOrStop kStart chnget "start" insno nstrnum "SoundFont" if changed(kStart) == 1 then event "i", "SoundFont", 0, -1, gkNote, gkVel endif kStop chnget "stop" if changed(kStop) == 1 then turnoff2 k(insno), 0, 1 endif endin ``` Another little note is about loading sf files in Unity: probably Csound won’t be able to find the file at runtime, import the _Environment Vars_ sample from the CsoundUnity section of the Unity package manager and have a look at the _SFDIR_ scene. You will have to place your sf file under a _Resources_ folder, and rename it to _\< name of the file \>.bytes_ ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [May 1, 2023, 10:39am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/8 "2023-05-01T10:39:33Z")
I was able to do it! 17 seconds was clearly a mistake! Now that the test is complete, I’m going to let this thread be complete for now, although the integration into Unity may cause problems again. Thank you so much! ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [May 8, 2023, 7:59am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/9 "2023-05-08T07:59:25Z")
If I use the turnoff2 method, all sounds will be lost when multiple sounds are played on the same inst. Is there any opcode or method to release only certain notes? Thanks in advance. ---
**Author:** ![stevenyi](https://forum.csound.com/user_avatar/forum.csound.com/stevenyi/32/4_2.png) [@stevenyi](https://forum.csound.com/u/stevenyi)\ **Post date:** [May 8, 2023, 7:50pm UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/10 "2023-05-08T19:50:42Z")
If you use fractional instrument numbers I think you can turn off just those matching the fraction. ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [May 9, 2023, 4:07am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/11 "2023-05-09T04:07:31Z")
Thank you for your help!! I am trying to build a keyboard with 88 keys. The sound source is SoundFont. Sorry for my lack of understanding. Does that mean that I have to define 88 insts? ---
**Author:** ![g\_b](https://forum.csound.com/user_avatar/forum.csound.com/g_b/32/208_2.png) [@g\_b](https://forum.csound.com/u/g_b)\ **Post date:** [May 9, 2023, 7:54am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/12 "2023-05-09T07:54:18Z")
Have a look here: > **[The Csound FLOSS Manual](https://flossmanual.csound.com/midi/triggering-instrument-instances#using-multiple-triggering)** > > Csound FLOSS Section > Using Multiple Triggering ---
**Author:** ![tarmo](https://forum.csound.com/letter_avatar_proxy/v4/letter/t/c37758/32.png) [@tarmo](https://forum.csound.com/u/tarmo)\ **Post date:** [May 9, 2023, 8:28am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/13 "2023-05-09T08:28:28Z")
Hi! Here is a snippet from one instrument that I found: ---
**Author:** ![KANIYO](https://forum.csound.com/user_avatar/forum.csound.com/kaniyo/32/386_2.png) [@KANIYO](https://forum.csound.com/u/KANIYO)\ **Post date:** [May 9, 2023, 10:08am UTC](https://forum.csound.com/t/how-to-add-release-time-when-stopping-a-sound/1199/14 "2023-05-09T10:08:48Z")
I was able to do this by using fractional instrument. Thank you very much. I don’t know if anyone will need this, but I will leave the code. ```csound form caption("TITLE") size(300,200), guiMode("queue") pluginId("def1") button bounds(30, 20, 80, 40) channel("start1") text("Start1") button bounds(150, 20, 80, 40) channel("start2") text("Start2") button bounds(30, 100, 80, 40) channel("stop1") text("Stop1") button bounds(150, 100, 80, 40) channel("stop2") text("Stop2") -n -d sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ;load a soundfont prints "------------LOAD SF--------------\n" isf sfload "soundfont.sf2" sfplist isf sfpassign 0, isf instr PlayOrStop kpreset init 1 kNote1 init 60 kNote2 init 64 kVel init 100 krelease init 0.2 kStart1 chnget "start1" if changed(kStart1) == 1 then instrnum1 = 2 + i(kpreset)/100 + i(kNote1)/100000 event "i", instrnum1, 0, -1, kNote1, kVel, krelease, kpreset endif kStart2 chnget "start2" if changed(kStart2) == 1 then instrnum2 = 2 + i(kpreset)/100 + i(kNote2)/100000 event "i", instrnum2, 0, -1, kNote2, kVel, krelease, kpreset endif kStop1 chnget "stop1" if changed(kStop1) == 1 then instrnum1 = 2 + i(kpreset)/100 + i(kNote1)/100000 turnoff2 k(instrnum1), 4, 1 endif kStop2 chnget "stop2" if changed(kStop2) == 1 then instrnum2 = 2 + i(kpreset)/100 + i(kNote2)/100000 turnoff2 k(instrnum2), 4, 1 endif endin instr 2 inum init p4 ivel init p5 irelease init p6 ipreset init p7 ivel init ivel/127 ;make velocity dependen kamp linsegr 1, 1, 1, irelease, 0 ;envelope kamp = kamp/3000 ;scale amplitude kfreq init 1 ;do not change freq from sf a1,a2 sfplay3 ivel, inum, kamp*ivel, kfreq, ipreset outs a1, a2 endin f0 z i "PlayOrStop" 0 z ```