This allows you to create very rich sounds easily. In the top section you can adjust the global volume and tranposition and choose the reverbtype. The all notes off button is used to stop notes that get stuck once in a while. It is also triggered by the backspace key. For each voice you can select 1 of the 365 patches that are available from the Beatnik voicebank.
Volume adjusts the soundlevel of a voice.
Pan adjusts the left-right balance of a voice. Modulation gives a voice more vibrato. Reverb gives a voice more reflection. The effect depends on the environment chosen with reverbtype. Chorus makes a voice sound like there are more of them together.