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Looking for TEAC AX-10 user manual/instruction sheet

Please help! I purchased a TEAC A-3340S 4-channel reel to reel tape recorder/player through a seller on Craigslist. The seller threw in some extras, including two (2) AX-10 Sound-On-Sound Echo Units. I have heard great things about these old analog echo devices, including that one can use these devices as an effect for electric guitar. In fact, according to an article from an electric guitar player magazine, Ritchie Blackmore uses the sound-on-sound effect from a vintage reel to reel tape player to help him get his tone.

Unfortunately, I have no idea how to use these AX-10 devices. The Craigslist seller didn't have any manuals, instructions or other paperwork that came with either AX-10. I have searched the Internet using Google and Ask.com to see whether anyone had posted instructions for the TEAC AX-10 or was even selling an old manual, but have found absolutely nothing.

If anyone has a manual or instruction sheet for a TEAC AX-10, or has any information as to how to use a TEAC AX-10, please contact me. My email address is posted below.

Thank you for any help you may be able to offer,