ic has good input but low output...???

[marrstians]

i'm working on a couple of pedals but this one's for my deluxe memory man... i've been audio probing the circuit to try and find the problem and here's what i have so far... all the sad1024's have good input and output on all of the pins except for the 4th one of the line up... it has good input and output on the B channel but only has good input on the A channel, then the outputs for channel A are almost dead... i've tried turning the trim pots but it doesn't seem to do much for my problem... what would cause an ic to have good input but really low output?... help

[puretube]

a: worn out IC;
b: faulty capacitor between IC & next stage;
c: both;
d: s.th. else;

(if the ICs were socketed, it`d be easy to find out by swapping)

[marrstians]

yeah the ic's are socketed... so it's not the ic's... i've switched them out and it's all the same on that one spot... if it was a faulty cap wouldn't i get signal on the ic itself and just not at the next stage???

[puretube]

no, the next stage`s bias would disturb the preceding`s stage DC-level
(or the other way round, with the same effect), if that cap would be leaky (= DC-conducting).