Everything installed in proper order, clean install, no other mods, all fixes installed.
1) Pump sound never off.
3) If player with jetpack (any type) jump - jetpack sound will play.
4) Jetpack hover mod randomly corrupt sound system, causing permanent looping sound of jetpack.
only full client restart helps.
5) Same occur to compessor.
6) Moving away from sound source cause hurge lag. (fps down to 1-10 from 200)
Removing every sound from jar and disabling sound decrease memory usage form 600+ to 170 on minecraft startup.
Disabling sound ingame (via sound slider help sometimes).
Using nether portal cause hurge memory leak, 300+ mb per nether visit, deplete 32 bit system memory in 4-6 runs. (it capped on 995 mb).
IC2 sound system will run ever if you disabled sounds in minecraft.