I have created a frequency sweep modulating the center frequency of a BP filter. Right now, the output of the modulating oscillator maps onto the values 50Hz-22.05kHz. Obviously, this creates a sweep that spends a long time in the high end, and only a very short moment in the bottom end. It seems to me that the proper map would flip the exponential curve that frequency lies on, thereby reversing the acceleration. Audibly, this would sound like a linear sweep from high to low, no?
Nonetheless, I'm lost. I have searched and searched the forum and don't seem to find a thread that addresses this exactly. I can understand the math if you give it to me in small bites... Please help!
Beyond this, I'd like a way to do this that is changeable. In other words, I'd like to dynamically change the frequency values that are mapped onto (so, move from a sweep between 50Hz-22.05kHz to a sweep between 440Hz-2kHz.) Does anyone have an object for this? I've been looking at lp.scampf, but it doesn't seem to serve my purpose. Isn't this just a sort of alternate for zmap? If I'm missing something--like a particular scaling factor that I should use--please let me know.