GMS-1340 Polywav™ Player

Plays 16bit Stereo WAV files from a library of 2048 files

The GMS-1340 Polywav™ Player is a multitrack polyphonic wav file player. The unit can be controlled from USB MIDI, DIN MIDI, gate level trigger, or CV/gate inputs. Files are played from a microSD card inserted in a slot in the front panel. The stereo wav file playback sample rate is 44.1 KHz with a sample resolution of 16 bits. As many as 14 stereo wav files can play simultaneously with their relative levels controlled by MIDI velocity commands. 

Two operational modes are provided, RUN mode that allows the sample player to perform playback operations and EDIT mode that allows the user the ability to load file banks of related samples, configure the types of playback triggers that will be used with the file banks and to set other playback parameters that are used during the RUN mode. A 1 inch OLED display, pushbuttons and a data entry encoder serve as the user interface. 

The module output is provided as a stereo left and right channel output. The output level can be set for -10dB for use with an external mixer or +4dB for output to other synthesizer modules that require higher level waveforms.

Two CV and gate trigger inputs are provided. A 0-10V CV signal will be digitized on the rising edge of the associated gate input, quantized to a MIDI note value and then used to select an associated playback file. The MIDI channel and the center of the voltage range associated with C4 MIDI note value can be preprogrammed. 


  • Operation Manual
  • Datasheet
  • ModularGrid

Technical Specifications

File format
16 bit 44.1 kHz stereo WAV

Polyphonic voices
Up to 14 simultaneous with independent playback level

File playback length
Limited by available storage

Playback trigger inputs
16 gate (0-5VDC) inputs, USB MIDI, DIN MIDI, 2 CV (0-10VDC) and gate (0-5VDC)

Trigger modes
Play while gate enabled
Play until end of file

Trigger outputs
Trigger jacks 13-16 used to output triggers synched to USB MIDI or DIN MIDI playback events

2 audio outputs, selectable output levels (+4db, -10db)



We produce electronic synthesizer modules in the two most popular formats, MU (Moog compatible 5U) and EU (Eurorack compatible 3U). A wide range of voltage controlled modules including oscillators, amplifiers, mixers, envelope generators, special effects units, wave generators, filters, power systems and cases allow users complete freedom to configure any desired electronic music instrument.


Grove Audio builds microphones, preamplifiers, equalizers, compressors and other professional audio equipment for performance and studio use. We build units in popular formats such as 19 inch rack mount and 500 series 3U modules. We can also produce custom designs on request. Contact us for a consultation.


You can explore all of our products, download spec sheets, and purchase our products in the Grove Audio Synth Store. You can also learn about our periodic specials and new product introductions. Click the button below to go directly to the store.

Follow Us!

Grove Audio Help
  • Email:
  • Phone: 608 886-6503


Grove Audio has been manufacturing professional recording and modularized electronics for musicians and performers since 1995.