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What's "Instrument info file" ?
Instrument info file is a file that exported from your yamaha keyboard via USB port. The instrument info file with a serial number of your keyboard (has been encrypted) and it's imported to YEM (Yamaha Expansion Manager).
When you want to buy our Voice Expansion Pack (ex: Dance-Pop Pack, Dance PSM Pack 1 ...); after make a payment via Paypal on our website: http://www.prostylemusic.net you have to export the instrument info file and send it to us.
When we are received your instrument info file, within 24 hours we will send to you a download link with your pack that you purchased.
You can follow this video to export the instrument info file from Yamaha PSR S970 & PSR S770.