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    Demo shop · Halvard Instruments · not a real business

    Specification

    Dimensions

    168 × 96 × 32 mm

    Weight

    410 g with the battery

    Case

    Anodised 6061 aluminium, bead blasted

    Power

    USB-C, or four AA cells for about nine hours

    Audio out

    3.5 mm line, 3.5 mm headphone, both stereo

    Sync

    3.5 mm in and out, 2 PPQN, and MIDI over USB

    Converters

    24-bit, 48 kHz throughout

    In the box

    The instrument, a USB-C cable, two patch leads and the folded manual

    A note on the battery

    Leave alkaline cells in it for a year and they will leak into a board we would rather not have to repair. Take them out if it is going in a cupboard.

    read the manual

    Halvard Instruments
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    products

     

    • instruments
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    • audio
    store

     

    • all products
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    • returns
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    • our story
    • how we build
    support

     

    • guides & manuals
    • firmware
    • spare parts
    RK-4 Modular Voice
    RK-4 Modular Voice — image 2
    RK-4 Modular Voice — image 3
    Synths

    RK-4 Modular Voice

    $429.00AUD

    Taxes and shipping calculated at checkout.

    A complete voice in 42 HP: oscillator, filter, envelope, VCA and a modulation source, normalled together so it makes a sound the moment it is powered and comes apart the moment you patch it. 42 HP, 32 mm deep Normalled signal path Twenty-two 3.5 mm jacks Draws 180 mA at +12 V

    Ships from Malmö within two working days.
    Repairable at any age. Parts held for ten years.

    Detail

    1. A control panel photographed close

      Fig. 01

      One knob per parameter. Nothing is two presses deep in a menu.

    2. The inside of an instrument on the bench

      Fig. 02

      Six screws and the back comes off. The schematic is on the site.

    3. An aluminium case under studio light

      Fig. 03

      Bead-blasted aluminium, anodised. It marks, and it is meant to.

    Goes with it

    HV-1 Analogue Monosynth

    HV-1 Analogue Monosynth

    Synths
    $649.00AUD
    PO-9 Pocket Synthesizer

    PO-9 Pocket Synthesizer

    Synths
    $99.00AUD
    HV-6 Polyphonic Desktop

    HV-6 Polyphonic Desktop

    Synths
    $999.00AUD

    synths

    • PO-9 pocket
    • HV-1 mono
    • HV-6 poly
    • RK-4 modular

    samplers

    • SP-2
    • DR-1
    • GR-16

    field

    • FR-2
    • FR-1
    • CM-1

    monitoring

    • MN-5
    • HD-2
    • cables

    owning one

    • manuals
    • firmware
    • spare parts
    • repairs
    • warranty

    ordering

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    • returns
    • contact
    • dealers

    the workshop

    • about
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    • work here

    legal

    • terms
    • privacy
    • WEEE & recycling

    Designed and assembled in Malmö. Nothing is glued shut; everything comes apart with a T6 driver.

    © 2026 Halvard Instruments AB

    Sweden / EUR · prices include VAT

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