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9.5.4 The dynamic hold-function
The dynamic hold-function works as a "gate" . With each trigger or active gate at the trigger input of the
envelope generators, the gate is opened for a short time (20 ms) and passes the dynamic-voltage (see
chapter 9.1) 'in front of the gate' . Then the gate is closed, but the last voltage level is held 'behind' this
gate, before it will be reopened by the next trigger.
tim e
Fig. 9.5.7 The dynamic hold-function
The upper graph in fig. 9.5.7 corresponds to the waveform of an e.g. kickdrum. The graph below shows
the resulting voltage curve, derived from the dynamic-module (see. chapter 9.1.). When a gate-pulse at
the start of every kickdrum (3. graph) is sent to the trigger input of the envelope generator, each "kick"
opens the gate of the dynamic hold-function. This is explained in the lower graph.
The 20 msec gatetime of the gate preserves an useful basic value. After the first incomming audiosig-
nal (here kickdrum) at the input (24), the detector needs a short attack-time until it is "in tune" .
If e.g. a plucked guitar string triggers the audiotrigger, a control voltage equivalent to the initial volume
of the audiosignal is generated and held by the dynamic hold-function. This voltage can be used to
control the multiplier and thus the modulation depht of the envelopes resp. the filter cutoff.
The effect of the dynamic hold outputs (see. also fig. 9.5.7, down) on the envelope (see. chapter 9.5.3)
is equal to the "AMT1/2"-input, according to the graphs in fig. 9.5.5 and fig. 9.5.6. To determine explicit
voltage levels, see the values at the sockets „DYN OUT" (7)/RING (s. chapter 9.1)
We proceed with a description of the control elements of the envelope generators.
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