MIDI Polysher is a free MIDI filter plugin designed to enhance control over your master MIDI keyboard by allowing you to create multiple key and velocity zones. While it was originally developed with eaReckon BloXpander users in mind, it is compatible with various VST host software that support MIDI filtering. This flexibility makes it a valuable tool for musicians looking to customize their MIDI input and performance setup within different digital audio workstations.

The plugin offers several useful features including a transpose function, a MIDI channel filter, and global filters for continuous controller data, pitch bend, and aftertouch messages. These controls provide musicians with the ability to tailor their MIDI signals precisely, enabling more expressive and dynamic performances. Because it operates as a MIDI filter, MIDI Polysher can effectively manage and manipulate incoming MIDI data before it reaches your instruments or other plugins.

It's important to note that the ease and functionality of using MIDI Polysher depend on the MIDI routing capabilities of your host software. While BloXpander now includes built-in MIDI filtering features, making this plugin less essential for its users, MIDI Polysher remains a useful option for those working with other DAWs. Its straightforward design and broad compatibility make it a practical addition for musicians seeking to refine their MIDI control.