no idea, metal I think
very very solid and very expressive
looks like a Juno crossed with emu emax 1
sound wise reminds me of a polysix, Juno 60, sh 101 and 202, sci six track combined with 4 tracks to play with and also the strangest tr seq, plus 202 seq and Juno arp plus a Roland analog drum machine, also analog filter input for analog sampling ala emu emax
pretty freaky synth, well worth the expense
consider this -
101/202 $1000
Juno 6 $1200
six trak $800
polysix 1200
Roland tr sequencers and drum machines 800-4000
emu emax $500
ensoniq dp4 $500

so as you can see the a4 keys is a bargain at $1800. :wink: