What is Wrappe[k]?

It is a windows keygen storage and execution environment,
where a software Gui contains a minimal Windows Wrapper.

Quaver is a musical calculator and look-up utility aimed at recording engineers and composers.
Quaver can calculate the delay times and oscillator frequencies that match a given tempo to help keep things in sync.
Its pitch tool can tell you the fundamental frequency of any note in the MIDI range - or perform the reverse calculation.
Finally, the scale tool can tell you the notes that make up a given scale and draw the key signature.