This is a quick demonstration of 3 of the available filter cartridges you can purchase and plug into an Avalon. These work alongside the internal 303 filter via a toggle switch. With this button pushed, it engages the filter cartridge. It expands upon the original TB-303 design and allows more tonal range and effects.

R:OTA = the Roland JP and SH series filters
2044 = The SSM filters from classic synths like the Prophet and Polysix
SEM = Oberheim SEM multimode filter

Ladder filter = based on the Moog filter (not shown) is also available

Lastly in the video, I show the FR button which toggles between a 6db filter at 70Hz and 30Hz.

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