You can simultaneously use both types

Linear 25 Ω/10K Ω potentiometer

EFX Mobile APP with OTG connection

1mm barrel input

It has no controls

Vox AC15C2 Custom Twin Combo Category_For Bass You can simultaneously use bothVox AC15C2 Custom Twin Combo The VOX AC15 is the amp that started it all. Boasting both a Normal and Top Boost channel, the AC15 Custom Twin is an all tube, EL84 driven workhorse that delivers 15 watts of authentic British tone into a pair of genuine Celestion Greenback speakers. The AC15 Custom also offers footswitchable spring reverb and classic VOX tremolo to enhance the already impressive sound. Adored by the biggest names in music for nearly 60