The part of the synthesizer that amplifies the sound that is generated by the oscillator. It normally has a control input which affects the level of amplification and which is normally be driven by an envelope or an LFO....
Axxe
The Axxe is basically a monophonic version of the Odyssey (which was
duophonic). It came with "Lessons in Electronic Music" (a 155 page textbook),
"Instant Axxe" sheets that you could lay over the front panel that showed you
patches, "Axxe blanks" (blank patch diagrams), an interface diagram (to hook it
up with other synths), and a book of 50 patches.
The ARP Axxe (like the Odyssey) is also equipped with "Proportional Pitch
Control (PPC), ARP's latest contribution to more expressive synthesizer
performance. The triple-pad, pressure-sensitive controller lets you bend notes
sharp and flat, and add vibrato, all without moving a single slider or switch."