APPENDIX
© E-mu Systems, Inc. 1985
Page 83
Enhanced by The Emulator Archive 2002 www.emulatorarchive.com
Removing the ground connection defeats the safety advantage of using a
three-wire plug. Make sure the SP-12 chassis - some other path to ground
(usually via the audio input and output cables). Having two paths to ground
can cause ground loops, but having no paths to ground can cause a potential
shock hazard if there’s an equipment malfunction in the studio. E-mu cannot
be responsible for the use of ground lifters in improperly or inadequately wired
environments.
Using signal processing while recording:
Just as with regular recording, there are
no absolutes about recording signals with or without signal processing. Some
engineers feel that tracks should always be recorded flat to allow for the maximum
number of options during mixdown; others prefer to record with a bit of processing,
especially if the processor might be needed on another track when mixing.
Here are some thoughts about the use of various types of signal processors when
recording samples.
External Preamp:
If you need to preamplify the signal being sampled, set the
Sample section GAIN SET to 00 dB and use an external, high-quality preamp to
increase the signal level going into the SP-12. The SP-l2 preamp noise level, while
acceptable, is sometimes not as quiet as an external mic preamp.
Limiting Dynamic Range:
Limiting the signal being sampled can put a higher
average signal level into the SP-l2, thus improving the already excellent signal-to-
noise ratio. Also, the limit point can be set just under the SP-12 overload point, which
makes level setting less critical.
Equalization:
If using EQ gives a better instrument sound, then use it. You want the
best possible sound going into the SP-12, so if a little EQ is indicated, it’s usually
better to add it while recording rather than having to think about it during playback.
Compression:
Compression can be helpful when looping sounds since it evens out
level changes, thus reducing any tendency towards loop “glitching” due to abrupt
level changes between the beginning and end points of the loop. If appropriate, use
the SP-12’s decay option to shorten the overall decay time and restore the original
signal dynamics.