Current plans.

I'm *attempting to make a karaoke game for flash and/or mobile cell phones. I'm trying to go with flash mostly because of ease and general ubiquity of flash.

The major problem is getting frequency of the sound from the microphone. Amplitude is no problem though.

It's hard enough actually getting a karaoke pieces which consists of basically two sound files (instrumental and vocal). The instrumental plays in the background, vocal amplitude is adjusted by how good the player is doing. Also in order to isolate the frequency of the vocal I had to rip apart vocal part into a raw text file/array of integers. The accuracy check occurs every second as to minimalize/compress the raw data. And to wrap it all up all parts vocal,intrumental,raw data,microphone output all has be to in sync with each other.

maybe I should switch to java?

Eh.. I doubt you have the capability to do that much with flash, and even if you somehow did get that far into it (treat it as a binary string, and parse it??), it'd be ALOT of code. I think java is better suited.