Only 2 in use - one in the "studio" and one which is my wifes but I use for internet too. Both are PC. Never owned a Mac though I admire them, they were always overpriced in the UK, but more reasonable just now.
For a long time I only had an Atari STFM for midi until my wife came home with a car full of obsolete pc cases and stuff in her car that her workplace were dumping - mostly 386 and 486. After scoffing that pc's are crap I gave into temptation and made 2 that worked with Win3.1 and one even had a modem but I refused to use the net (no free local calls in the UK and no subscription ISP with bundled calls either back then). I didn't use them for music, but did have many happy hours playing Doom while my wife wasted her time with Solitaire!
Then AOLuk managed to get British Telecom to do bulk local call rates and so internet access was turned on, together with online shopping for computer parts - then the upgrading started.
The machines we now have have little in common with those first 386/486's - Both AMD Athlon XP - I think the floppy drive in the wifes machine is the only original bit. Although I tend to completely refresh my Studio pc drives on major rebuilds, the wifes has been simply upgraded so there are some folders and files on it's current 20GB drive that were on the original that was only 210MB! I believe in fixing problems rather than the reformat/reinstall tactic nowadays and WinXP really is an improvement in this respect.
Bits left over from successive upgrades have been built into machines for family and friends - at least 4 are still in use.
I'm meaning to get a laptop so I can mix when I'm away and also have plans to build a machine purely for softsynths, but other needs keep getting priority.
I keep the Atari in the Studio as well as
my Roland VS840 recorder as a threat to the pc to get it's act together - a tactic that has mostly been successful.
Hidding in the cellar, are my first 3 comps.
The first ever was a Science of Cambridge Mk14 which I think was Sir Clive Sinclairs first commercial computer product - before the ZX80. This had an 8 character calculator style display, a hex keypad and a massive 256 BYTES of ram driven by NatSemis first and short lived ScMp cpu. I actually made a sequencer with this with a home made 8bit D/A converter which played my old ARP Axxe synth in time to the step pulses from the first Roland Dr Rhythm drum machine. I had a ball learning to program this entirely in machine code - not so much fun was having to enter the program everytime because it had no storage. So I built a cassette tape interface but I had to load the code for that by hand too!
Then came a Dragon 32. This was a British copy of the Tandy Color Computer (CoCo) with 32K of ram and the wonderful Motorola 6809 cpu. Having mastered 6809 code well enough, I got another machine and built the board and PSU into a 19" rack case and made a card rack in it for its expansion bus. This housed an Eprom blower, 2x8bit A/D/A interfaces and one of those Texas Instruments soundchips used in early video games. Attached to a seperate keyboard case and TV type greenscreen monitor, I was the proud owner of something that looked a bit like a FairlightCMI. Programs were blown into Roms but I still loaded sequences off cassette tape.
Still running the ARP in sync to
the Dr Rhythm, I actually gigged with this thing which was christened
the FP1 (F*** Pig One) because we expected nothing but trouble - in fact it never let us down!
Not enough time for such DIY exploits now, and everything is relatively so cheap, it isn't really worth it. But many happy hours (between girlfriends)studying data sheets were wasted back then. Now I waste those hours grappling with other peoples designs.
Both our machines pretty much do everything asked of them so no updates currently planned. The one thing I need more of is the time to be creative, but you can't download that.