I have used their Quadra Thru box with similar good results. However, I have not tried using it to power multiple sound modules: [Begin Pasted info]
MIDI Solutions Thru boxes provide additional MIDI Thrus wherever required in a MIDI setup. For example, a Thru box can provide the connections to send a single MIDI data stream from a keyboard to multiple sound modules.
As MIDI devices are daisy-chained together, MIDI signals gradually lose their integrity due to passage through optoisolaters at the devices’ MIDI inputs. MIDI Solutions Thru boxes can be used to clean up the MIDI signal at any point in the chain where it is starting to become unrecognizable (actually all MIDI Solutions products clean up MIDI data in this way). Be careful of other Thru boxes that amplify errors along with the signal; MIDI Solutions Thru boxes actually read in the data and re-clock it out at the correct baud rate, eliminating any errors that have accumulated due to daisy-chaining or long cable runs.
Click here to see an application of the Quadra Thru in Gus G’s Ozzy stage rig" [End Pasted info]
If that’s not enough, I’d recommend you look at their FAQs
and then if you still need more, send an e-mail off to Midi Solutions. email@example.com