Description

RR Janko® Keyboard – Slim-Key Version

Based on Midiplus X Series III (X4 III / X6 III / X8 III) | Modified with RR Janko® Slim-Keys

This product is based on an original keyboard of the Midiplus X Series III, professionally modified by Reinert-Piano with RR Janko® Slim-Keys. Reinert-Piano is an independent manufacturer. There is no affiliation with the original brand.

Special Advantages of our RR Janko® Slim Keys

The narrow 4-row arrangement of the RR Janko® Keys promotes an ergonomic hand position.
Unlike the original Janko keyboard, each key is fully accessible along its entire length, allowing fingers to remain in a natural extension at all times.
Adjacent semitones are easily accessible without shifting fingers to higher or lower rows.
The thumb can always be positioned below longer fingers and easily repositioned at any time.
There is no need to reach down into a “gap” with longer fingers, a common issue on traditional keyboards.
Replace with precisely crafted 3D-printed keys.
Available in standard or five-seven Layout

Features and Advantages of the Five-Seven Layout:

Clear color arrangement in two blocks
C–E dark, F–B light
Easy recognition of octaves
Reduced visual complexity, as color variation occurs only horizontally, not vertically
Greater clarity, as colors change only once per octave
Freedom from the strong focus on a single key (C major = white keys on a traditional keyboard), all keys are treated equally
Greater freedom when improvising and easier key changes
Preservation of pattern recognition from the traditional piano through the two color blocks: the three dark keys represent C, D, E, and the four light keys represent F, G, A, B
This allows previously learned piano pieces to be easily transferred to this layout and enables sight-reading

Material & Construction

High-quality 3D-printed components
Precisely fitted and mounted
Durable and lightweight construction
Each unit individually inspected

Base Unit – Midiplus X Series III

All models feature identical functionality:

4 assignable rotary knobs
6 assignable buttons (transport functions or MIDI CC)
1 clickable multifunction encoder
Pitch and modulation touch strips
Octave and transpose switches
Smart Scale mode (16 scales)

Connections

Sustain pedal input (6.3 mm jack)
Expression pedal input (6.3 mm jack)
MIDI OUT (5-pin DIN)
USB Type-B (class compliant)

Power Supply

USB bus-powered

Housing

Robust metal construction

Model Variants Overview

The difference lies solely in key range, size, and weight:

X4 III – compact & mobile

Dimensions: 782 × 193 × 87 mm
Weight: 3.5 kg
49 keys

Ideal for mobile setups and space-saving environments.

X6 III – extended range

Dimensions: 947 × 193 × 87 mm
Weight: 4.0 kg
61 keys

More keys for expanded musical expression.

X8 III – maximum range

Dimensions: 1325 × 193 × 87 mm
Weight: 5.6 kg
88 keys

Full playing range for advanced performance and studio work.

Important Notice

Not manufactured by Midiplus in this form
Modified original device
Distributed under the RR Janko® brand

All trademarks remain the property of their respective owners.

The Result – RR Janko® – Keys reimagined

A proven MIDI controller – reimagined for a more intuitive and structured playing system.

Production & Shipping

Each instrument is made to order after payment is received.
Production time is approximately 15–20 business days. Shipping takes place after completion.

Shipping Cost Notice

Import duties, taxes and customs clearance fees are not included and are the responsibility of the buyer.