hey guysss ive got my own custom made pedal box with 5 boss pedals, 1 ****ty cheap pedal, a green screamer and a van halen phaser. ive got the TSL601 valve combo and when i try and do squeals with the boss super chorus and 1 or 2 other pedals not just boss i get a weird crackling noise not a nice squeal through the chorus effect.

any ideas on what the problem could be???

A broken lead? test them all straight into your amp. Most likely a loose connection in one of the pedals.