An English sound patch for the Korean-only Mega Man X7 PC port has been out for quite some time. Unfortunately the sounds are incomplete, voices are off-pitch and CG cutscenes aren't spoken in English. It was an admirable effort but not quite up to snuff. Thanks to Gnite Productions, though, this patch is now pretty much perfect (or as perfect as X7's dub can be).
The patch includes ALL English voices and resolves previous pitch issues. You can hear it in action below:
Mega Man X7 English Voice Patch v1.00 is available to download from Gnite Production's website here. Extraction password is 'gniteproductions'.