iConnectMIDI4+
USB MIDI Class Compliant Supports Over 64 Ports of 16 Channels of MIDI I/O Per Port Plug and Play - No Drivers Needed Charge iOS Devices Audio passThru™ Between Up to 3 Computing Devices
around 150$
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You can connect up to three ipads or three computers at the same time and do complex routings between them plus a usb host . it has advanced midi filtering and is super stable.also will charge the devices. Only downside is that you need a computer for the setup.