Inputs and outputs: the TWAmp has one 1/4" input (from guitar), one 1/4" output (to amp or P.A.) and one 1/8" TRRS I/O for iDevice (and other devices).
Effects: Built-in 8 effects: 3 types of Reverb, Delay, Tremolo/Delay, Leslie style Tremolo, Auto-Wah and Overdrive. Chorus is under development.
Effect parameters: each effect has three parameters. For example, the delay/echo effect has the following: Speed, Regenerate and Reverb.
Save/recall of effect settings: there are 10 memory locations for each effect where you can store/recall favorite effect settings.
Power: 3 AA batteries hold for an average of 8 hours.