Korg Poly800/EX800 Users

I have a Moog Slayer'd + FM'ed Poly-800 Mk. I. I haven't tried the battery modification. I have 
successfully loaded patch data into it previously, but there has always been a problem with 
the programs above number 30 or so. After number 35, all the programs are random hissy 
noises, almost no tones. Also, recently, I've attempted to load patch data into it and nothing 
occurs. I set the tape switch on and press load, play the .wav file from my computer's 
headphone jack into the 'to' tape 1/8 inch port on the synthesizer. When the .wav is finished 
playing, it doesn't say error or good, it just remains 'load' or 'verify'. There are lots of cool 
sounds I would love to tweak if I could load them into the machine. Also, the memory 
seemed to be wiped, so many of the sounds I had programed were lost. I'd love any 
suggestions on how to fix this problem

Thanks!

Andy, Poly800 Enthusiast