and right inputs. In this case the INPUT MODE switch will have no effect on the signal since
the input signal is already mono.
TYPE (Switch)
This is a two position switch that selects between two distinct modes of operation. The
operation of the four modulation controls are also changed by the position of this switch.
3 PHASE
This is a recreation of the classic three phase three stage BBD ensemble effect made famous in
a variety of string machines like the Logan String Melody and Solina. The TRIANGLE RATE
and SINE RATE modulation controls do not function in this mode.
3 PHASE uses three BBD channels. With a stereo input and input mode switch set to stereo,
one BBD channel treats the left hand audio signal and outputs on the left, one treats the right
hand audio signal and outputs of the right, and one treats both left and right together and
outputs on both left and right equally. This creates a beautiful wide stereo sound even from
monophonic input sources. If you want the classic monophonic ensemble sound you will need
to do this externally from the SRE330 using your mixing desk. Simply set the mixer's input
channel to mono or use two separate input channels and set both pan pots to central.
Each BBD channel produces a delay. This delay is altered in real time by two fixed frequency
oscillators producing sine waves. One oscillator runs slowly and the other much faster. The
amount of modulation for all three BBD channels is adjusted by the two modulation depth
controls on the front panel. Each BBD channel is modulated by the same two oscillators but
each channel uses a different phase output from each oscillator. Each of the two oscillators has
three outputs, all sine waves and at the same frequency, but each output lagging behind the
next one by one third of one complete cycle.
MULTI
This is a recreation of some classic Japanese chorus and ensemble units. All four modulation
controls function in this mode. The actual mode of operation is determined by a second
switch, MULTI MODE.
MULTI MODE (Switch)
This three position switch selects between the three different modes, quad, dual, and stereo
(the latter was called Dimension on some older panels).
With the SRE330 set to MULTI there are up to four BBD channels in operation. Each side of
the stereo signal has two dedicated BBDs and, like in the 3 PHASE mode, each BBD has its
own driver circuitry which controls the delay imparted by that BBD. Once again these driver
circuits are modulated with low frequency oscillators (LFOs) producing a varying delay from
each BBD channel.
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