Conversation so far:
What kind of instrumentation did they use?
A piano chord, replayed backwards, serves to augment the build-up of effects.
Were there any particular songs they used this technique on?
are immediately followed by the opening of "Breathe.
Were there any other songs that used the technique?
CANNOTANSWER.
What other different techniques did they use?
The sound effects on "Money" were created by splicing together Waters' recordings of clinking coins, tearing paper, a ringing cash register, and a clicking adding machine.

Question: Did they use synthesizers?
Self-contained rewrite: Did The Dark Side of the Moon use synthesizers?