Circuit Descriptions - Korg Poly-800II Service Manual

7. CIRCUIT DESCRIPTIONS
1. SYSTEM EXPLANATION
The Poly-800n system does not contain the KLM-598 Chorus circuit board used in the Poly-800. but replaces it with a new KLM-779
circuit board which contains the following new circuits; Digital Delay circuitry (DDL), Programmable Equalizer circuitry. 128Kbit
EPROM for the System Program. 64Kbit STATIC RAM for timbre data storage, etc.
Other circuit boards have revised numbers, and some minor changes have been made.
Differences in specifications between the POLY-800H and the POLY-800 are described on the following chart.
POLY-80QH/POLY-800 COMPARISON CHART
ITEM
POLY-800H
POLY-800
EG
DEG1-3
Decay
Slope
Release
Exponential
Linear
Time
However, when Sustain level is greater than
Break point level (slope envelope rises), then
slope of envelope is linear.
Time —
Ratio of change is always equal
VCF Multiple
Trigger
Trigger takes effect when KEY ON.
Trigger takes effect from any point when Key ON
EFFECT
Built-in Digital Delay
Delay. Chorus. Flanging, Dubbing & other effects
available according to setting of Digital Delay
value.
(programmable)
Built-in BBD Chorus
Chorus ON/OFF only
(programmable)
Built-in Equalizer
Treble ±10dB, 2kHz
Bass ±10dB, 300kHz
(programmable)
Not available
SEQUENCER
Max. no. of steps
(1 step equal to 1
note, rest or tie)
1,000 steps
256 steps