Alesis MMT-8, Service Manual

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Alesis MMT-8 Service Manual 1.00 6
3/8/89 1.09 1) If a song was stopped and continued within the first part of the song, the MIDI
output of the sequence would not always be in sync with the click, MIDI clock, and
display. This is now fixed.
2) If a track of a song was shifted by 2 or more 384th notes, and one or more of the
parts of the song was 1 beat in length, the first occurrence of a 1 beat part would be
played twice, causing that track to be delayed by 1 beat. This is now fixed.
3) Fixes bug in which if two events such as controller, program change, or aftertouch,
occurred on the same beat, and any edit operation was performed (such as ERASE,
QUANTIZE, LENGTH, etc.), then stepping backwards through this event in step edit
mode would cause non-existing events to show up in the display, which could cause
the machine to lock up.
4) Fixes bug which system exclusive data would be played back incorrectly if the
track with the data was set to any MIDI channel other than UNCHANGED.
5) Fixes bug in which events could be inserted into an empty track in step edit mode
repeatedly, until the events being inserted occurred before beat 1.
6) Fixes bug that would cause a song to continue from the wrong part if a step was
selected in edit mode and then STOP/CONTINUE was pressed.
7) When changing the name of parts or songs, the characters will no longer loop from
the last character (
∅ ) to the first character (space) and vice versa.
8) Added feature that allows locating directly to any specific beat of a part. This is
accessed by holding either the fast forward or the rewind button, and entering a beat
number with the keypad. If in stop, pressing STOP/CONTINUE will continue the part
from the selected beat. If in play, the part will continue from the selected beat when
fast forward or rewind is released. In SONG mode, this feature can be used to locate
directly to any beat within the current step of the song.
9) Fixes bug that caused a track to stop playing if the track was shifted forward in
time (+1 to +48 384th notes), and the song was stopped during the last beat of a step,
and the track had already played the first beat of the next step. If continue was pressed
from this point, the shifted track would no longer play. This is now fixed.
7/22/89
1.10 1) If in song mode with the first step of a song being a one beat part, and rewind is
held until the display reads step 00 beat 000, and then stop/continue was pressed while
holding rewind, The first step would be played twice, and offset tracks may be out of
sync. Stop/continue is now ignored while holding the rewind button.
2) The start/stop footswitch jack is now scanned at power on to determine the polarity
of the switch that is plugged in (normally open or normally closed). For this to
function properly, the footswitch should be plugged in before turning the power on,
and it should not be pressed when turning the power on. If no footswitch is plugged in
at power on, the MMT-8 will assume a normally open footswitch.
3) If the start time of an unquantized note added to its duration results in the exact
beat that the note would be quantized to, performing a quantize note start would result
in a duration of 00/000 (e.g., note start of 001/47 duration 000/01 when quantized
would become 001/48 with a duration of 000/00), which is invalid, and could result in
a fatal crash if other notes existing on the same beat are edited. This is now fixed.
4) If a note event and a sysex event exist on the same beat, rewinding past the events
in step edit mode would cause the display to skip the sysex event, and only show the
note. If more than one note existed as well, the note preceding the sysex event would
also be skipped. This is now fixed.
5) In step edit mode, erasing a sysex event could cause a track to have erroneous data,
which could lead to a crash. This is now fixed.