Hi ChucKers! I have a sonification project that I'm wondering if it makes sense to do in ChucK. I have a csv file with frequencies and amplitudes for 4 different sine waves, representing values at (say) half-second intervals. I want to read in a line, and then smoothly change the frequency and amplitude values using linear interpolation over the course of 24000 samples (a half second at 48k samples per second), then read in the next line, and smoothly change to those values over the next half-second, etc. until the data runs out. I could code this in C using libsndfile, but if I didn't have to worry about converting frequencies into phase distances between samples I'd consider that a win. I noticed Chuck has FileIO methods to read input files (although these are very poorly documented) so thought it should be possible to read in a csv file. I could calculate the amount of frequency and amplitude change per sample and adjust these in a 1-sample loop, and that's already simpler than coding in C. But I'm hoping there's some way to tell ChucK "I want this (e.g. frequency) value to change smoothly from its current value to f1 over the course of a half-second". If that were possible, ChucK would be a clear choice for my project. Thanks for any response! Forrest Cahoon