[LAU] XG Sound Generator Alternatives

I would love to upgrade my old PIII clunker. Apparently, all the better motherboards lack ISA slots nowadays. The older speakerphone modem I have in a slot can be cheaply replaced with a PCI version of the same ilk. My problem is my old Yamaha sw60xg sound card. This is a rusty, trusty MIDI sound generator with audio DSP (no audio interface to the computer). It can be made to work on anything using mpu401, no IRQ, no DMA, no problems. Can be controlled using the old XGedit run with WINE. Decent sounds and I have many mixes based on this. Yamaha's stuff is too proprietary, closed, for alsa support. Their sw100xg is still a fantastic PCI audio/MIDI card but no alsa support. The sw60xg did not need it. So what alternatives might I have. (A quad-core screamer might run virtual- instruments OK.) The same sounds are available on old serial port versions from Yamaha but there must be something better around in 2010!