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- 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??? =
- ================================================================
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