kenton electronics merge-4 price : $145.00

4 opto-isolated midi ins and 2 midi outs. powered from a mains adaptor (wall wart) so you can fit and forget.

features:
4 x midi in
2 x midi out (both carry identical midi data)
merges all midi data including sysex and clock
dc power input jack 2.1mm (centre +ve)
power indicator light
9v unregulated power supply included (uk, eu and usa types available)
we automatically ship the correct power supply for the destination country.
housed in a metal box so it can withstand the knocks

attractively finished in brushed aluminium with black screen print
dimensions: 110mm x 80mm x 35mm
weight: 700g including power supply