From jarrell7@yahoo.com Tue Oct 09 12:17:27 2001
Subject:Re: Merge box problem

Active Sensing is part of the MIDI spec, but MIDI devices are not
required to implement it; it is an option. Any manufacturer that
relies on devices implementing it is taking a risk and/or not reading
the spec clearly.

- jarrell

--- In CloneWheel@y..., "Dan S" wrote:
> I think what you're referring to is the active sensing message. If so,
> that's a part of the MIDI protocol and would have nothing to do with the
> required current/voltage required. The hardware layer must be in place for
> the software protocol to work.
>
> Getting things to work with a specified standard is difficult enough.
> Counting on unspec'd side effects is a risk that will, as we've heard,
> result in varying degrees of success/failure.
>
> > The word according to Roland was that the MIDI out port
> > should send an "I'm alive" pulse every so many ms. Some
> > keyboards don't adhere to this spec so they can't power these
> > line powered units.
> >
> > All my Roland keyboards work fine with my MIDI solutions
> > merger, but I have some master keyboards made by less 'well
> > known' manufacturers that mean I always have to make sure I
> > am merging a Roland MIDI out with one of these for the merger
> > to work properly. The cheapo controller I use for my
> Seems that not
> > everyone has implemented the original spec, because if they
> > did, these line powered units would work just fine.