Program mode: hd-1, Hd-1 overview – KORG Electronic Keyboard User Manual

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Program mode: HD-1

HD-1 Overview

The HD-1 High Definition Synthesizer is Korg’s new
flagship PCM synthesis engine, featuring outstanding
sound quality, unique sound-design tools, and a rich
array of modulation possibilities, including:

• Ultra-high-quality sample interpolation, based on

new, proprietary technology, for minimal aliasing
and crystal-clear high frequencies

• Over a gigabyte of ROM and EXs sample libraries,

using only uncompressed PCM

• Dual-OSC structure, providing two complete voice

chains for layers and splits

• Within each OSC, up to four-way velocity splits

and crossfades (including two-way layers)

• Wave Sequencing, for creating rhythmic patterns or

complex, evolving timbres

• Vector Synthesis

• Dual multi-mode resonant filters

• Drive and Low Boost, for adding per-voice grit,

girth and distortion

• Three envelopes, two LFOs, and two AMS Mixers

per OSC, plus a common LFO, Vector envelope,
and KARMA for the Program as a whole

• Two complex key tracking generators per OSC,

plus two more for the Program as a whole

• Extensive real-time modulation capabilities

OSC2

OSC1

Common

LFO

HD-1 Program Structure

Vector

OSC1

OSC2

KARMA

Effects

Mixer

& EQ

Key

Track 1

Filter B

Pitch EG

Filter EG

LFO 1

LFO 2

AMS

Mixer 1

AMS

Mixer 2

Filter

Key Track

Amp

Key Track

Amp

HD-1 OSC Structure

Osc

Serial/

Parallel

Serial/

Parallel

Filter A

Drive

Amp