BSS Audio DPR-504 Owner's Manual - Manual (Page 18)

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gate 'chattering' on and off during natural short pauses in program material,
such as speech. It always precedes the start of release. To minimise operator
set up time, the DPR 504 incorporates the hold function by combining it with
the release function. These two functions still remain independent, however
their adjustments have been combined onto the one control. In general, at
small release time settings the hold time will be small; at longer release times
the hold time will be correspondingly longer.
The auto attack facility of the DPR 504 will cover all but the most transient of
program sources, and has been carefully optimised to produce good envelope
control. For super fast attack times, the user can select the fast position.
The release control can be set to around 1 second for many applications, but
provides control over a wide range to allow more critical tuning in sensitive
applications. The decay contour has been given a special audio taper which
ensures that even relatively fast releases can occur unobtrusively and
musically. It is also highly operator fault tolerant, and the user will soon
appreciate the improvement this makes over the more conventional linear or
logarithmic decay.
The audible character of any release setting is significantly altered by
changing the range (refer to section 7.7) between -70dB and -20dB. Whilst the
-20dB setting provides sufficient attenuation for effective but more gentle
gating than the -70dB range, it also gives the audio tapered release envelope
a subtly different musical feel. For a given release time setting, the gate has
less 'far to go' on the -20dB range setting, and this variation effectively
doubles the range of decay contour options available to the operator.
Fig 7.2a Gate timing
stages - single transient
Operating Instructions