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Total Irrelevance 2
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Total Irrelevance 2.adf
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Vol2_SYNC.WTR
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Vol2_SYNC.WTR
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1993-07-03
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128 lines
That SYNC'ing Feeling
"""""""""""""""""""""
What is this about?
~~~~~~~~~~~~~~~~~~~
Are you the proud owner of, or do you have access to 2
Amigas (or maybe more!), A 4-channel audio mixer, a
couple of midi interfaces and last, but by no means
least a copy of OctaMED? If the answer is yes then you
may be interested to know that it is possible and very
easy to link them together via MIDI to have 8 channels
of samples without using the limiting 8 channel mode on
one Amiga. (Any mixer with 4 or more channels can be
used, including portastudios.)
(Mixer's start from about £2O from places like Tandys - ED)
The Theory
~~~~~~~~~~
This system is based on MIDI using an operation called
the SYNC (synchronisation) process which sends timing
signals from the MIDI OUT of the `Master amiga'
to the MIDI IN of the `Slave Amiga'.These signals include
song position, start, stop and continue which keep, in
this case both Amigas running, starting, stopping
or continuing exactly together when the `song' gadgets
are activated.This does not work when playing or
continuing the block, only the song!
In Practice
~~~~~~~~~~~
To get the system up and running you have to set up the
2 Amigas as MASTER AND SLAVE where one amiga controls
the other. (in my case an A1500 controlling an A500.)
This is achieved by plugging a midi interface into each
of the computers' serial ports and plugging the correct
type of cable from the MIDI OUT port of the MASTER to
the MIDI IN of the SLAVE computers interface (This has
to be 5-pin DIN to 5-pin DIN which is the standard for
midi signal cables.).The audio phono leads have to be
routed through a mixer to combine the signal of 4 sound
channels (L and R from each Amiga). Then, preferably
into a hifi (See TI1.). For a graphic description see
the accompanying diagram.
The Settings
~~~~~~~~~~~~
Octamed has to be booted up on both machines, therefore
two TVs or monitors are needed.On the MASTER Amiga you
have to enter the MIDI screen and activate the
following gadgets:-
- MIDI ACTIVE - This turns on midi.
- SEND SYNC - This sends the relevant SYNC signals out
when song PLAY or STOP are activated.
The settings for the SLAVE Amiga to be activated are:-
MIDI ACTIVE
- EXT SYNC - Tells the Amiga that it will be controlled
by an external source.
- INPUT - This has to be set as midi data will only
be incoming.
Writing The Song
~~~~~~~~~~~~~~~~
There are a few things to remember whilst writing the
song, as they're quite important.The SLAVE Amiga can be
played and stopped using its own SONG gadgets, this is
useful if only, its channels are to be played. When the
song is to be played, both the SPEED or BPM settings
must be the same.(Note that for using 8 channels, only
4 channel mode is needed to be set on each computer,
but you could use both computers on 8 channel mode to
obtain a maximum 16, half quality channels.).
CONCLUSION
~~~~~~~~~~
Many more possibilities are gained by doing this, like
larger chords and more chip memory. One computer could
be used for drum and vocal samples, with the other for
the chords & melodies. Or one computer could be used to
play only the lengthy samples like breakbeats and vocal
excerpts to keep the whole memory of the other computer
for the tunes and fx...etc.......
----------+----------
Happy songwriting,
This is me, Simon Ouzman, signing off.
Bye.....
================================================================
= EDITOR'S : Surely you could bypass the need for a mixer =
= EDITION with a simple Y-Lead. 2 sets of stereo phono =
= plugs to one set of stereo phone plugs??? =
================================================================