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 reversing ramp with offset
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| Author | Topic: reversing ramp with offset | |
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flo Member |
posted 25 October 2004 12:42
 
a question regarding my sound “MarimbaCues&Waves”, which you can find in the attached sound file: why is it that reversing the FullRamp (in the FunctionGenerator) doesn’t work anymore, after I added an offset to it? There’s probably something wrong with the offset code, but somehow I’m blocked at the moment, can’t find the mistake… Florian IP: Logged | |
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mathis Member |
posted 25 October 2004 14:40
Your patch managed my Kyma to crash, wow... While asking for the spc files. Generally I wonder if it is so wise to use constants for what you´re doing. The HotParamter fields only "see" their input every millisecond, so you get steps. Maybe better use Gain for the reversing. The offset thing I still don´t really understand. I´m unfortunatly handicapped through the crashing. IP: Logged | |
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SSC Administrator |
posted 25 October 2004 19:34
I am not sure what you want to accomplish, but the Constant called TimeOffset is clipping: (!TimeIndex + (([Mixer] L + 1) * (2 - !TimeIndex)) - 1) Mixer's range is -1 to 1, so [Mixer] L + 1 varies from 0 to 2. !TimeIndex varies from 0 to 2, (2 - !TimeIndex) has the same range, so this product varies from 0 to 4. Subtracting 1 gives a range of -1 to 3 and adding !TimeIndex again makes the range (-1->3) when !TimeIndex is zero, (0->2) when !TimeIndex is 1, and (1->1) when !TimeIndex is 2. The output of the Constant clips to (-1,1) and the TimeIndex parameter of the SumOfSines does the same. This means that when the expression is outside the bounds of (-1,1) the SumOfSines will be synthesizing the same spectrum (either the first or the last spectrum depending on whether you are less than -1 or greater than 1). If you can say what you would like to accomplish, we could suggest an alternate expression. p.s. I didn't have any troubles running the Sound here... IP: Logged | |
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flo Member |
posted 26 October 2004 11:13
Thanks for the clarification. I copied that code in part from another sound, but oversaw that the context is slightly different, furthermore it was a little late and I mixed up all the ranges...this all caused a kind of r.e.m. without sleeping :-) What I wanted to accomplish is not that difficult: I wanted to be able to go through the spectrum from almost* any single point in the spectrum in normal and reverse direction. At the moment I'm working on a solution, with a Ramp and a !TimeIndex (offset) dependable !Scale for that Ramp, that probably will work out. I'll finish that (better to do it on my own first) and let you know , then you maybe could show me other alternatives...maybe there is a simpler solution... Thanks, Mathis, I'll implement your advice and compare. * backwards from -1 doesn't make any sense of course IP: Logged | |
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flo Member |
posted 28 October 2004 08:28
in several graphical steps (with constants for example), also with respect to troubleshooting, but it turned out to be more confusing somehow. So therefore I worked out all the math on paper first and then implemented this code into the SOS and the FunctionGenerator. Now I am able to do what I wanted to do. Is this still improvable? IP: Logged |
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