Acorn Instruments, developer of high-value, digital musical instruments has announced the availability of the Masterkey 61, the latest addition to their acclaimed Masterkey line of USB keyboard controllers. The Masterkey 61 offers 5-octaves of full-size, synth-action keys intended for more elaborate two-handed playing styles while its smaller siblings, the Masterkey 25 and Masterkey 49 introduced earlier this year, work great for tweaking and editing midi data during production or composition.