I have this old Digitech RP255 multi effects professor that isn't producing any sound. I bypassed the 2.5mm barrel jack since I only had 2.1 and it powers on but no sound
Digitech RP 255 Guitar processor with Looper - Catawiki
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User manual for DigiTech RP255 - a user manual, servicing manual, settings and specifications ofDigiTech RP255 - User manuals and advice for your devices - User-Manual.info
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DigiTech RP255 Multi-Effects Guitar Effect Pedal (No Adapter) Works Nice! | eBay