If memory serves, the Poly 800 has MIDI dump capabilities. A simple dump would be easier to manage than a tape wave file. I remember having done the same thing on a friend's Poly 800; my DX7 was connected on it, and I accidentally dumped the memory. Korg's MIDI implementation was weak (buggy?) enough to accept the dump, and it reset everything. Needless to say my friend was rather moody for a while :-)
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From: rspetty@...
Date: Sun, 3 Aug 2008 21:11:29 +0000
Subject: [vintagesynthrepair] Poly 800II Factory Settings
Hi, a friend of mine accidently erased his presetsin his Poly 800II. I
am in need of a wave file of the original factory tape. If anyone knows
of one, or where a copy of the wave file is on the net. Any help is
greatly appreciated. Ron