Analogue-sequencer

On 6 Dec 2005, at 22:57, Colin f wrote:

> I would think the drivers could play a large part in this - MIDI  
> interfaces
> themselves are little more than USB COM ports running at MIDI baud  
> rates.

The original MIDI Time Piece was a RS-422 device which could run 8  
MIDI ins and 8 outs via a multiplexing protocol. (The Opcode Studio-N  
boxes were similar, using OMS for the control protocol.) I presume  
all the current MOTU models are USB - I have a thing called a Micro  
Express which is a cut-down, 4-in, 6-out, USB box in the MTP series.  
It has some onboard intelligence - routing and filtering, as well as  
SMPTE-to-MTC conversion - and also believes in timestamped messages  
to improve timing (it says here). It also knows about beat clock in a  
particular way: MIDI realtime bytes go to all MIDI outputs (whether  
you want it or not), and SPP messages basically go nowhere unless  
you're running Digital Performer.

I've had two MTP's and this Micro Express box, and had no problems  
with beat clock which couldn't be pinned down to the application  
software.


   nick rothwell -- composition, systems, performance -- http:// 
www.cassiel.com