MIDI drum machine Sync to Sonar Artist?

This video can be used as a guide. its basically the same exact process.

 
The thing most people confuse is forgetting to set the drum machine to emit the midi signals from the drum machine to sonar.
So go in to your Roland's settings and make sure midi data is being output through the midi ports.

The 707's getting on a bit these days - with that age of machine it's difficult to be sure it's working properly sometimes. Haven't seen one "in the flesh" in years, though they seem to be about a bit on YouTube these days.

To find out what's sending MIDI where and what that MIDI is, the free downloadable MIDIoX tool is indispensable. One of the most useful things there is for working with MIDI.

As for the clock, leave Sonar as master. Software clocks aren't always rock solid and drift by a few tiny fractions of a beat but hardware MIDI units that send clock aren't always any better. On top of that there's a minute amount of drift caused by the time it takes a synth to respond to MIDI which differs from synth to synth, again by a very small but present amount. No-one noticed this in the days of tape recording, but once the actual wave-form became visible in a DAW under an accurate to the millisecond timeline it suddenly became something really important to worry about.

Using Sonar/a DAW as master clock simplifies things as more hardware gets added, which it always seems to be over time.

One thing to watch, once you get the 707 sending MIDI, is that it needs "local off" or if that isn't possible/doesn't work you might need to record the MIDI with the MIDI track output pointing at something that won't make a noise - e.g. the wrong channel for the synth. Otherwise the 707 might trigger twice for each note.

As for recording the audio, just hook it up to your audio interface and hook up the MIDI connections. Tell Sonar to send it clock, SPP and stop/start (all in per project preferences and need setting for every project). With any luck starting Sonar's transport will then start the 707. If all else fails you can record it a pattern at a time using ghe internal sequencer and sync Sonar to the resulting recording afterwards.

Another way of working is to record short bits of stuff and use them as raw material in the DAW. I've a Machinedrum which has very complex song structuring available but I often record its patterns one instrument as a time then assemble them in the DAW rather than chain them in the MD. That way I can add further processing or change the structure of the project without having to re-program the Machinedrum's song structure all the time.