Hi, thanks for your message.
I am looking to add a midi expander to the serial port, something similar to C-Lab's Export to add additional midi channels, there are a number of DIY serial port solutions too.
The problem with all of these is that they introduce a significant amount of latency when dealing with 3 channel's worth of midi data and one of the reasons for this is the baud rate of the serial port.
Midi data requires a baud rate of 31250, I believe this is part of the reason that midi expanders for the serial port tend not to work very well and result in unreliable midi playback.
I did have some concerns about the software I was going to use (Notator) being able to access these increased speeds and was wondering whether running something like HSModem could set the serial port speed before using some midi expander in the serial port?