There can be only one MIDI clock stream on one MIDI circuit, it's not
possible to mix two.
Of course it's possible to mix outputs of musical (e.g. channel) data
from two sequencers or MIDI players running at two different tempos.
It has sense in the case when each sequence uses different MIDI
channels as then there can't be any data confict (like Note On/Off,
controllers, PB, AT and so). Rather experimental attitudes, those
polytempi...
I got the same result - polytempi - when I multiplied or divided
position of notes by some constant different from 1 in old good
Notator on Atari (= time compression or expansion with MIDI data).
Then each track got different tempo despite the fact there only one
clock with main tempo.
Daniel Forro
On 4 Jan 2011, at 3:23 AM, ASSI wrote:
> On Sunday 02 January 2011, zoinky420 wrote:
>> hmm I have several mergers but never thought of using them that way.
>
> Most mergers don't handle real-time data well. Some do a
> reasonably good
> job, but you may have to use a designated input (often port 1) for
> the clock
> source to get a stable timing.
>
>> Theoretically it should work but I've never seen it mentioned in any
>> manuals as an option. I've got a three-processor merger with midi
>> filtering, so I could conceivably merge two different sequences at
>> any
>> tempo to one MIDI out, and control the tempo to both of them by
>> merging
>> a third channel of nothing but clock data?
>
> No, that's not how MIDI clock works. You'd get the two sequences
> at their
> original tempo plus an unrelated MIDI clock that is only seen
> downstream of
> the merger.
>
>
> Achim.