70
ENVELOPES
In order to fully understand the MIDI module it is recommended that you
experiment with other AMS modules. The EDITOR, KEYBOARD and
SYNTHESISER all use ENVELOPES to describe different instrument
sounds. These instrument sounds can be changed within each of the
modules to provide an unlimited range of sounds. The above modules can
store 30 of these sounds (or ENVELOPES) for use within EDITOR or
KEYBOARD compositions. New sets of envelopes can be loaded into the
modules via the FILES (LOAD) command line pop-up in the form of two
sound files (refer to the COMMAND LINE section of the manual). Each
sound (s.) file contains 15 envelopes or sounds.
These sounds are created edited and saved from the SYNTHESISER
module. They use the internal Commodore sound hardware.
When a MIDI file is created the external MIDI envelope numbers as used
by your MIDI keyboard are automatically assigned to internal AMS ENVE-
LOPE numbers 1-15 as they occur. Since some MIDI keyboards are able
to use up to 255 different envelopes, you must ensure that the AMS
envelope numbers to which the MIDI envelopes are assigned simulate the
sound of the MIDI envelope. This may require that you use the SYNTHE-
SISER to edit the ENVELOPE file so that when the MIDI (x.) music file is
converted and saved to a AMS music (m.) file are played back through the
EDITOR, the sound is roughly equivalent to the original MIDI input.
When a AMS (m.) file is loaded/converted back into MIDI the original MIDI
envelopes are re-installed so that on playback through the MIDI keyboard,
the correct sounds are played.
During a MIDI recording session you may change the MIDI envelope from
the MIDI keyboard as often as you like. However if you use more than 15
different envelopes the automatic envelope assignment will overflow into
AMS envelope number 15.
You can manually change this assignment of MIDI envelopes to AMS
envelope numbers via the ENVELOPE ASSIGNMENT device. Use the
Z
and
X
keys to view how these envelopes are assigned. Use
SHIFT Z
and
SHIFT X
to change the MIDI envelope assignment.
15
127
Z
X
<>
TMS ENVELOPE
SHIFT
Z
X
<>
MIDI ENVELOPE
