Oberheim GM 400
Digital Signal Processor
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To set a group in OFF or BYPASS status:
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Select the group using the CURSOR keys or the VALUE encoder.
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Press the ENTER/WRITE key (the display will show OFF/BYP in alternation).
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Press the EXIT key to return to the main menu page.
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when the light is off: no function available.
Bypass key.
The BYPASS key also provides two functions, but in this case the procedure obtained
depends on the video page on the screen:
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main video page: as we already know, this key provides a GENERAL BYPASS of the entire
chain of effects, or in other words allows the user to listen to the input signal unchanged.
Pressing the key provides two conditions:
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light on: the processing chain is active.
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light flashing: multieffect system in GENERAL BYPASS status.
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in the main edit video page: allows the user to choose between BYPASS (BYP) and ON
status for the selected group.
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in subsequent edit pages: provides a LOCAL BYPASS, meaning that it switches the
selected group only (e.g. DST or CMP) into BYPASS status.
We will try to give a rapid explanation of the difference between these types of BYPASS and
the types already seen, in order to prevent misunderstandings and allow operators to use the
GM 400 correctly. The LOCAL BYPASS function cuts out one group (e.g DISTORTION, EQ
or MODULATION), while the GENERAL BYPASS disables the entire chain of effects
simultaneously. It must be underlined that the two types of BYPASS referred to here are
temporary, unlike the BYPASS activated in the main edit video page, which will be memorized
together with all the patch parameters. It should also be remembered that the OFF and
BYPASS statuses in the main edit video page have the same result in terms of sound. The
difference between these two values in practical terms becomes obvious when the optional
Oberheim FC 3000 foot controller is used, since the foot switches it provides allow the user to
switch any one of the groups set in BYPASS status to ON. On the other hand, the foot
controller will have no effect on the groups in OFF status, which will be completely out of use.
Compare.
This key has two functions:
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when its light is on: it activates the sound compare function. In other words, it allows the
user to make a comparison by alternating the sound modified in an EDIT session (current
situation) with the sound memorized in a patch taken as the starting point for the
modification process. It is used to check the worth of the new settings before saving them
and replacing the original patch with the modified one. While the comparing procedure is in
progress, the display will show:
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