I don't have experience with any external sequencers but I was interested in your question and did a little internet research. Have you accessed the Yamaha website via Bing Search for <qy100>? Yamaha supplies all the OEM documents for it - user manual, spec sheets, etc. Also, there are maybe 50 FAQ sheets detailing special use details for that specific device. Looks like its been around since 2000. Good reading and maybe helpful to you.

The Yamaha device specific midi driver for that machine is also available via a hotlink at the website.