[linux-audio-dev] "declicking" algorithm?

[Paul Coccoli]

Here's a poorly written description of my problem (the code in
question is written from scratch in C++, BTW):

I have a simple gain function that takes a number between 0 and 1 and
multiplies each input sample by that number.  If I use the output of
an LFO to get that gain number, I gets clicks in my output (presumably
on when the LFO output changes by and number close to 1, as it would
with a pulse/square wave).  How can I get rid of these clicks?  Do I
need to "smooth" the output of the LFO, or my processed output?  If
so, what is a good way to do that?

On a semi-related note, can someone recommend any Free libraries in C
or C++ that implement things like oscillators, filters, etc.?