Replacing the Battery In a Ensoniq ESQ-1 - YouTube
I just replaced the internal battery in my Esq-1 and made a photo guide for anyone wanting to do the same : r/synthesizers
Ensoniq VFX Electric Keyboard Synthesizer EUC W/ New Battery Tested & Working | eBay
The Ensoniq VFX-SD is a wild synth to begin with, but the All-Waves mode that cycles through the different samples and wave forms is just bonkers : r/synthesizers
Ensoniq VFX-SD Synthesizer w/New Battery, Original Manual – Synthchaser