Active Opcode Output Changing Before Instrument is Done
| Date | 2016-06-20 01:55 |
| From | Emmett Palaima |
| Subject | Active Opcode Output Changing Before Instrument is Done |
Hi, I am currently working on an app an app that models an additive synthesizer, and in order to enable polyphony while simultaneously avoiding clipping I was using the active opcode to scale the amplitude of my oscillator. This works great except for that active seems to be registering a change in the number of active instruments before the instrument fully shuts off.
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This means I get a Warning, Division by 0 error every time the last instance of my instrument is turned off. I tried reworking the way I was scaling the output to avoid this, but this causes the output of the instrument to be scaled up just as it is turning off, leading to a more pronounced click. I will probably solve the issue with the port opcode, but that seems like kind of a work around, so I was wondering if anyone else could suggest a better solution. Here is the instrument I was using. instr 2 kactive active 2 kcps init (440.0*exp(log(2.0)*((p4)-69.0)/12.0)) ;translates midi to pitch aosc oscil3 1/(kactive+1), kcps, 2 ;this is the version that creates clicks ;aosc oscil3 .5/kactive, kcps, 2 ;this is the version that gives division by zero warning outs aosc, aosc endin |
| Date | 2016-06-20 08:32 |
| From | Iain McCurdy |
| Subject | Re: Active Opcode Output Changing Before Instrument is Done |
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Could you attach the full instrument and provide details of version and platform? When I test the code you provided, it works for me as you desire without a div. by zero error. Iain Date: Sun, 19 Jun 2016 19:55:55 -0500 From: epalaima@BERKLEE.EDU Subject: [Csnd] Active Opcode Output Changing Before Instrument is Done To: CSOUND@LISTSERV.HEANET.IE Hi, I am currently working on an app an app that models an additive synthesizer, and in order to enable polyphony while simultaneously avoiding clipping I was using the active opcode to scale the amplitude of my oscillator. This works great except for that active seems to be registering a change in the number of active instruments before the instrument fully shuts off.
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Discussions of bugs and features can be posted hereThis means I get a Warning, Division by 0 error every time the last instance of my instrument is turned off. I tried reworking the way I was scaling the output to avoid this, but this causes the output of the instrument to be scaled up just as it is turning off, leading to a more pronounced click. I will probably solve the issue with the port opcode, but that seems like kind of a work around, so I was wondering if anyone else could suggest a better solution. Here is the instrument I was using. instr 2 kactive active 2 kcps init (440.0*exp(log(2.0)*((p4)-69.0)/12.0)) ;translates midi to pitch aosc oscil3 1/(kactive+1), kcps, 2 ;this is the version that creates clicks ;aosc oscil3 .5/kactive, kcps, 2 ;this is the version that gives division by zero warning outs aosc, aosc endin |
| Date | 2016-06-21 05:39 |
| From | Emmett Palaima |
| Subject | Re: Active Opcode Output Changing Before Instrument is Done |
Here is the turnoff instrument as well. Both are controlled by the score events triggered by Steven Yi's keyboard from the Csound for iOS examples. keyDown triggers: i2.%d 0 -2 %d, %d keyUp triggers: i1 0 .1 2.%d %d represents the midi note number of the key in both cases. instr 1 ;turnoff instrument used in conjunction with keyUp turnoff2 p4, 4, 1 turnoff endin instr 2 kactive active 2 kcps init (440.0*exp(log(2.0)*((p4)-69.0)/12.0)) ;translates midi to pitch aosc oscil3 1/(kactive+1), kcps, 2 ;this is the version that creates clicks ;aosc oscil3 .5/kactive, kcps, 2 ;this is the version that gives division by zero warning outs aosc, aosc endin On Mon, Jun 20, 2016 at 2:32 AM, Iain McCurdy <i_mccurdy@hotmail.com> wrote:
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| Date | 2016-06-21 05:40 |
| From | Emmett Palaima |
| Subject | Re: Active Opcode Output Changing Before Instrument is Done |
My bad, small typo: keyDown triggers: i2.%d 0 -2 %d
On Mon, Jun 20, 2016 at 11:39 PM, Emmett Palaima <epalaima@berklee.edu> wrote:
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