I have not tried audio input (yet), but found the combination of PDL and SoX quite powerful to synthesize and play sound, including spectral analysis. Here's a screenshot of one of my experiments (sine waves and playing with overtones).

I use PDL to create the raw audio data and SoX to pipe them to whatever sound system is available (means: also works on MS-Windows), the waveform and spectrum display happen in real-time.

I plan to write an article about stuff like this for quite some time now, but there are so many distractions...

In reply to Re^2: Audio input and processing - recommendations by haj
in thread Audio input and processing - recommendations by Ashx

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