Trouble with simple oscillator keyboard

Hello everyone
Im a beginner and trying to make keyboard from 15 bc337 oscillator, just like this video

This is my progress picture

My progress video “fail”

When i turn the oscillator pot, it doesnt oscillate up

My progress video “sorta works”

I unplug the summing mixer, and just connect r7 1M (osc out) and ground into marshall ms2

I find those schematic on red**it
But i didnt make the amplifier, cause i use mini marshall ms2.

I still dont hook up the push button, and trying to make summing mixer based on lookmomnocomputer schematic, but it just humming, maybe i fried the tl072, ill buy new ic tomorrow.

Then i unplug the summing mixer, and just out after r7 1M and ground to my marshall ms2 speaker, and it sorta works, theres a lot of clipping, brrtt bbrt, when i turn up the volume

So how to make it sound clearer ?
Also in the red**it’s schematic, osc out (after r7 1M) means cv?
Cause i wanna make a simple cool vcf

I hope, i provide all the information required
Thank you

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