Maybe someone can point me in the right direction...<br><br>I am trying to figure out how to gradually change the frequency of an FMSound over time, for example a gradual slide from, say, 99.12Hz to 109.56Hz over a given amount of time (sort of like a very slow Doppler shift in a way, I guess). The actual function governing the frequency change could in theory be just about anything, but for now I am probably just looking at linear slides, and the length of time the slide could take could be seconds to minutes.
<br><br>I still consider myself a Smalltalk beginner, and my first instinct is always to "do it myself" because I have a hard time reading the existing code to figure out what has already been done. Thus, my first idea was to try to output small segments (say 1 sec each) of a fixed frequency into a SequentialSound, and increase the frequency [of each segment] over time. This "works," but with the fractional cycles inherent in non-integral frequencies and/or times it results in a sharp transient at the junction of each new frequency segment--resulting in unwanted audible clicks.
<br><br>Is there a way to "manually" adjust the phase of each subsequent SequentialSound so I can "line them up," or will the PitchEnvelope class completely take care of this for me and I just can't figure it out?!
<br><br>Overall, though, I have to say I am impressed with the depth of the classes in the Sound-Synthesis category, I just don't know how to use them! However, I am guessing that Squeak knows how to do exactly what I want to do!
<br><br>Thanks in advance for any help; I still have a hard time knowing if I am even looking in the right direction. I hope I explained the problem well enough--a picture would have been easier in this case!<br><br>Thanks again,
<br><br>Rob Rothwell<br><br>P.S. If the answer is at all related to how I would fade the volume of a sound in or out over 15 to 30 seconds, could you let me know?<br>