Great way of generating melodies from arbitrary voltage sources. Comes with stock scales are that use C as the root note, but you can always tune your oscillators to get into other keys, and of course, with the web editor, you can put whatever scales you want on it, including quarter tone scales! Pairs nicely with an attenuvertor (such as the Befaco attenuvertor) to control the range of your arpeggio. LFO is perfect as voltage source, or even an LFO going through a wave folder, for more exotic sequences. This module also has glide, which is another nice touch. Erica Synths Pico modules are some of the best ones in this range, in terms of functionality, size, and price. Very satisifed!