kosmiq, not sure if you can get any updated cracks (bar for Generals v1.8)! As AFAIK only the GAME.DAT file is updated in Generals/Zero Hour and GAMEMD file for Yuri, none of them update the actual EXE you run the games with!
I downloaded and extracted the RTP file for latest patches for Generals v1.8 and Zero hour 1.04 and none of them had references to GENERALS.EXE in the RTP, same for Yuri 1.001 no reference to Yuri.exe. So that's why I used the original v1.0 cracks as only the GAME.DAT/GAMEMD.DAT files are updated and needed cracking in the patches. I think I gathered all the 'proper' cracks for the games and they just need playtesting
Not had any slowdowns in RA2, loaded the first Allied mission and got Tanya to Fort Bradley, built a barracks and trained 5 G.I's with no sound problem! You must have something else in your rig causing that problem?