You can have the Juno-6 fitted with a Kenton MIDI retrofit kit. This offers the most comprehensive level of control.
Most of the features of the Kenton MIDI retrofit kit are aimed at controlling the Juno using MIDI.

For incoming MIDI:
Any MIDI channel can be selected
Notes (MIDI note numbers 36 - 96) - transpose possible
Pitchbend - (bends up and down a fifth)
Mod Wheel
Filter cutoff frequency (of low pass filter)
Volume
Sustain (decay on-off)
Arpeggio clock synced to MIDI clock - variable ratio allowing 1/4 1/8 & 1/16th notes as well as triplets.

For outgoing MIDI:
Any MIDI channel can be selected
Notes (MIDI note numbers 36 - 96) - transpose possible
Program changes 1 to 61 can be sent using a button press followed by a key press

Please see the retrofit info pages for more details about the retrofit kit.

Click here for information about and to buy the Kenton MIDI Retrofit Kit

Clock the arpeggiator

If you don't need to play the notes using MIDI, you can clock the arpeggiator using the Pro-SOLO mkII or a Pro-2000 or even a Pro-KADI, as they all have clock outputs. Again you will need a 3.5mm to 6.35mm jack cable.

click here for 3.5mm to 6.35mm jack cables (1 required):