H-Pi Instruments | Order Tonal Plexus

TONAL PLEXUS

"... to standard 88-key pianos what Yankee Stadium is to a Little League park" — The New York Times

Have you ever considered what kind of music might be possible if your keyboard had more than just twelve keys per octave? If so, you are not alone. In fact, it's been one of the most enduring and puzzling questions in all of music history. The Tonal Plexus is not just a product of years of research and development, but is a result of literally hundreds of years of experimentation with musical tuning, keyboard design and research in human pitch perception. The Tonal Plexus provides no fewer than 211 keys per octave, allowing the finest discrete control of tuning expression ever available on a MIDI keyboard. If you want to make music that truly sounds new and different, then this is the keyboard for you!

Before you buy ...

Each keyboard is hand crafted, and lead times vary from a few days to a few weeks. For lead time on your keyboard, just email.

Your choice of color applies to triple-accidental regions and the sides of the instrument. Custom options are available upon request.

ATA cases are optional for 2 octave keyboards, and larger keyboards are always shipped inside of an ATA case.

U-PLEX

U-PLEX 422 Keys Microtonal USB-MIDI Controller

U-PLEX is a class-compliant USB-MIDI controller with 422 keys, two octave transposition buttons, and a 1/4'' jack for sustain pedal input. It outputs untuned MIDI data to any application that receives MIDI. Licenses for TPXE and HPLF tuning software are included, allowing complete control over the pitch output of every key. Its small form factor and USB connectivity make U-PLEX an ideal choice for making microtonal music with laptop and desktop computers. | Details

14.5 x 9.5 x 2 in. (37 x 25 x 5 cm)
2.5 lbs. (1.2 kg)
ATA case — Pelican 1090

				U-PLEX $59900 ↑

... built for desktop & laptop music making

outputs untuned USB-MIDI data
class-compliant driverless USB MIDI device
USB jack for power and MIDI
SUSTAIN pedal jack (1/4'')
octave transposition buttons: up and down
includes license for TPXE and HPLF

TPX

TPX2 422 Keys Microtonal MIDI Controller

TPX2 is a MIDI controller with 422 keys and 32 full-range programmable tunings, which outputs tuned MIDI data and is compatible with all General MIDI tone modules. On-board controls include faders, switches, pedal inputs, and more. TPXE software allows any key to play any pitch. TPX2 is an ideal choice for portable microtonal music making using standard MIDI gear. | Details

18.5 x 9.5 x 3 in. (48 x 25 x 8 cm)
3 lbs. (1.4 kg)
ATA case — Pelican 1495

			TPX2 $99900 ↑

TPX4 844 Keys Microtonal MIDI Controller

TPX4 is a MIDI controller with 844 keys and 32 full-range programmable tunings, which outputs tuned MIDI data and is compatible with all General MIDI tone modules. Like its siblings, TPX2 and TPX6, TPX4 on-board controls include faders, switches, pedal inputs, and more. TPXE software allows any key to play any pitch. TPX4 is an ideal choice for microtonal music making using standard MIDI gear. | Details

30.5 x 9.5 x 3 in. (77.5 x 25 x 8 cm)
8 lbs. (3.7 kg)
ATA case — DoskoSport 10303

			TPX4 $159900 ↑

TPX6 1266 Keys Microtonal MIDI Controller

TPX6 is a MIDI controller with 1266 keys and 32 full-range programmable tunings, which outputs tuned MIDI data and is compatible with all General MIDI tone modules. Like its smaller siblings, TPX2 and TPX4, TPX6 on-board controls include faders, switches, pedal inputs, and more. TPXE software allows any key to play any pitch. TPX6 is an ideal choice for microtonal music making using standard MIDI gear. | Details

			42.5 x 9.5 x 3 in. (108 x 25 x 8 cm) 13 lbs. (6.1 kg) ATA case — DoskoSport 10202

... built for MIDI compatibility & portability

outputs tuned or untuned MIDI data
works with standard MIDI hardware and computers via MIDI interface
General MIDI compatible
MEMORY: 32 full range programmable tunings — create and upload your tunings using TPXE
TUNING PRECISION: 14-bit pitch bend resolution = 0.01¢
4 FADERS: panning, modulation, volume, and velocity
FADER SWITCHES: control SG waveform ADSR and equalization
2x20 DISPLAY: preset, tuning, bank, patch, and polyphony
JOG DIAL: select and enter preset program parameters
16 POLYPHONY SWITCHES: 1 to 16 voices
16 PATCH BUTTONS: store and recall synth banks and patches
16 TUNING TABLE BUTTONS: store and recall tuning tables
MIDI IN / program: use TPXE to upload tunings, or augment the keyboard with an external controller
MIDI OUT (tuned): connect to GM tone module or softsynth for tuned output
MIDI THRU (out untuned): connect to computer or external module for untuned output
SUSTAIN PEDAL: connect a damper pedal to control MIDI sustain
VELOCITY, VOLUME PEDALS: connect Lo-Z (20K) mono volume pedals to control MIDI velocity and volume
POWER: 12V DC input
includes international switching power supply and 2 free MIDI cables
User Manual (pdf)

TPXs

TPX2s 422 Keys Microtonal MIDI Synthesizer

TPX2s sports all the features of TPX2, with the addition of a built-in General MIDI synthesizer, stereo amplifier, and speakers, making it the ideal choice for stand-alone music making with maximum portability and ease of use. Just plug it in, turn it on, and start making microtonal music. | Details

18.5 x 13.5 x 3 in. (48 x 35 x 8 cm)
7.5 lbs. (3.4 kg)
ATA case — Pelican 1600

				TPX2s $129900 ↑

TPX4s 422 Keys Microtonal MIDI Synthesizer

TPX4s sports all the features of TPX4, with the addition of a built-in General MIDI synthesizer, stereo amplifier, and speakers, making it the ideal choice for stand-alone music making with maximum ease of use. Just plug it in, turn it on, and start making microtonal music. | Details

30.5 x 13.5 x 3 in. (77.5 x 35 x 8 cm)
12 lbs. (5.5 kg)
ATA case — Pelican 1700

				TPX4s $189900 ↑

... built for standalone portable music making

outputs tuned or untuned MIDI data
works with standard MIDI hardware and computers via MIDI interface
Built-in General MIDI Synthesizer (128 Patches x 2 Banks)
Built-in 22W Stereo Amplifier with Volume Control
Built-in 2-Way Crossover Speaker System
1/4'' Stereo Headphone Jack
1/4'' Line Out Stereo Jack
1/4'' Line In Stereo Jack
includes all details listed for TPX2, TPX4, and TPX6; e.g. TPX2s is TPX2 with the addition of a built-in synthesizer and amplifier, so that the unit becomes stand-alone, containing all that is needed to play and hear microtonal music at the flip of a switch.
User Manual (pdf)

TPX6s 1266 Keys Microtonal MIDI Synthesizer

Unlike the other keyboards in the TPXs line, TPX6s is not just TPX6 with the addition of a built-in synthesizer, amplifier and speakers; it features a different set of electronics with larger display, LED polyphony indicators, and a substantially enhanced interface with Live Control of synthesizer parameters. It also has a joystick, and a port for future expansion. This is the most complete solution available for stand-alone microtonal music making. Plug it in, turn it on, and start making microtonal music. | Details

				37.5 x 14.5 x 3 in. (95.5 x 37 x 8 cm) 16 lbs. (7.3 kg) ATA case — SKB-4214W

... built for standalone microtonal music making

Built-in General MIDI Synthesizer (128 Patches x 2 Banks)
Built-in 22W Stereo Amplifier with Volume Control
Built-in 2-Way Crossover Speaker System
1/4'' Stereo Headphone Jack
1/4'' Line Out Stereo Jack
1/4'' Line In Stereo Jack
outputs tuned or untuned MIDI data
works with standard MIDI hardware and computers via MIDI interface
General MIDI compatible
MEMORY: 32 full range programmable tunings using TPXE
TUNING PRECISION: 14-bit pitch bend resolution = 0.01¢
4 FADERS: panning, modulation, volume, and velocity
JOYSTICK: control global parameter assigned to fader 1
LIVE CONTROL: waveform ADSR and equalization, modulation parameters, Time Variant Filtering, reverb, pitch bend range
4x20 DISPLAY: shows preset, tuning, bank, patch, polyphony, and synthesizer parameter values
JOG DIAL: select and enter preset program parameters
16 POLYPHONY SWITCHES: from 1 to 16 voices
16 PATCH BUTTONS: store and recall synth banks and patches
16 TUNING TABLE BUTTONS: store and recall tuning tables
MIDI IN / program: connect to computer or external controller
MIDI OUT (tuned): connect to GM tone module for tuned output
MIDI THRU (out untuned): connect to computer or external module for untuned output and external control
SUSTAIN PEDAL: connect a damper pedal to this 1/4'' mono jack to control MIDI sustain
VELOCITY, VOLUME PEDALS: connect Lo-Z (20K) mono volume pedals to these 1/4'' jacks to control MIDI key velocity and MIDI volume
POWER: 12V DC input
EXPANSION BAY: space for future hardware additions
includes international switching power supply and 2 free MIDI cables
User Manual (pdf)

NOTE: ATA cases are optional for 2 octave keyboards, and larger keyboards are always shipped inside of an ATA case. Cases as shipped from the manufacturer or other retailer will not have properly fitted internal foam for Tonal Plexus keyboards. When you buy a case from H-Pi Instruments, you get it with internal foam properly fitted for the instrument. Ship safe!