You need to provide some more info about what is working and what is not working.
Is there any sound being produced at all? Under what circumstances is this the case?
Does the envelope generator do anything if you send it a pulse, e.g. does the led respond to an input pulse? Can you see the envelope generator’s output signal on the base of Q7 (or hear it using an audio probe)?
I encourage you to look into how to make an audio probe, it is dead simple (you only need a capacitor, some wire and an amplifier) and try to use it as a diagnostic instrument. Try it on something that works first.
Does the VCA work? You can test this by injecting a signal via a capacitor on the base of Q5, you should then hear something on the output if you send a trigger pulse to TRIG IN 1 (provided that is working)? Or inject a signal on the collector of Q5 OR the collector of Q6 via a capacitor (1uF should be enough). This may help in checking IC5’s working.
It can be helpful if we know what kind of test equipment you have.
Do you have an oscilloscope at your disposal, an analog or digital voltmeter? An audio probe?
Can you hear anything on the output of IC3 pin 1, or IC4 pin 7 and IC4 pin 1?