Modify VB6 Sound-to-Light program or redesign from scratch in VB6 or another language

We have a VB6 program that flashes some coloured rectangles on the screen in accordance with the frequency content of the currently playing audio input (stereo mix). At this time, the program works but has some shortcomings. 1. It is too slow to update. 2. The frequency windows need widening. 3 It has a sensitivity slider that should not be needed. If you can fix the existing program OR rewrite the code in another language to work better, we'd love to hear from you. Attached is the original specification and the VB6 source files for what was produced. Please read the original specification (pdf) and then run the existing program, feed in some music and you will see the problems. PLEASE NO PLACEHOLDER BIDS or BIDS OVER $200.