Sequential prophet 5 - Amplifier Envelope Generator (Amp Env Gen); Audio out (Aud Out); Common Analog

FILT cutoff (CTF) FREQ is controllable by several CVs combined in a SMR similar to those for OSC A
and B. FILT SUM CV results from UNI. W-MOD. and FILT CTF CVs. A switch in the KEY CV path
disables polyphonic tracking. In such cases a switch in the FILT MSUM circuit also subtracts UNI CV
from the FILT SUM CV.
As mentioned in paragraph 2-6. the FILT ENV GEN modulates the FILT through the FILT ENV AMT VCA,
and OSC B is effective through its P-MOD VCA and P-MOD FILT S.
2-8 AMPLIFIER ENVELOPE GENERATOR (AMP ENV GEN) AND AMPLIFIER (FIN VCA)
The AMP ENV GEN functions exactly like the FILT ENV GEN (paragraph 2-6). Its transient output
determines the amplitude contour of the FIN VCA.
2-9 AUDIO OUT (AUD OUT)
The final audio stage sums the output from all the voices, adjusts their overall level with the VOL VCA.
and amplifies the signal to drive an amplifier. (Besides by knob, volume may be controlled by an
external CV source, such as a voltage pedal.)
2-10 COMMON ANALOG
The COMMON ANALOG circuitry includes the OSC A. B, /TND FILT master summers (MSUMs).
GLIDE circuit, and the wheel which controls noise (NSE) or low-frequency oscillator (LFO) modu¬
lation (W-MOD). '
The MSUMs allow simultaneous pitch control and modulation of the VOICES. ASUM CV, the
common OSC A frequency CV. consists mainly of the OSC AINIT CV which follows the OSC A FREQ
control. The P-BND or MTUN controls effect pitch adjustment. When in UNISON mode, the indi¬
vidual voice KEY CVs are switched off, and UNISON (UNI) CV follows the keyboard. Increased
GLIDE CV delays quick changes in UNI CV. W-MOD output is added to A SUM CV when the W-MOD
FREQ A switch is closed.
OSC B MSUM is similar to OSC A. OSC B INIT CV, P-BND. and MTUN are combined in the same
manner. The OSC B KBD switch is closed for keyboard tracking in UNISON mode. For LO FREQ
operation, a switch applies negative voltage to the SMR. OSC B FINE CV allows vernier frequency
control of OSC B alone.
The FILT MSUM combines the FILT CTF CV, which follows the FILT CUTOFF knob, with UNI CV if FILT
KEYBOARD tracking is selected.
PW A MSUM is implemented on each voice, since it includes P-MOD circuit output. PW B MSUM
only needs to add OSC B PW CV with W-MOD.
The W-MOD signal switchable to OSC A, B or FILT FREQ and OSC A and B PW contains NSE or LFO
output as determined by the SRC MIX CV. CV inversion to the W-MOD LFO VCA allows NSE and LFO
levels to move in opposite directions. As SRC MIX CV increases. NSE output increases but LFO output
decreases. Pink (PNK) NSE is used for modulation. The MIX NSE VCA adjusts white (WHT) NSE level to
the voices. The LFO is similar to the voice VCOs .
2-11