While playing a modpack with open computers and immersive railroading, i found out, that with immerive railroading activated, the computer.beep function from OC only plays the noteblock sound, but without the mod, the "real" beep sound plays. Based on this issue i assume, that immersive railroading fills up all (or at least most) of the available sound memory, so that other mods (like OC or computronics (see here) as well) have no more space to use it.

Would it be possible to improve sound management, so that sounds are only loaded when needed and therefor keeping memory usage low?

1.4.1, i never tested with older versions

This should have been fixed a few versions back, what version are you running?

Try setting overrideSoundChannels to false in immersiverailroading_sounds.cfg

with overrideSoundChannels disabled, it seems to work