WVR is a next-generation sample player powered by an ESP32. WVR features 8GB of memory and an advanced Web GUI where users upload audio and manage configuration and firmware. WVR is Arduino compatible and open-source, and fits on a common breadboard, with room to access all the pins.

WVR offers users a wide range of control over the device via the Web GUI, so the majority of embedded audio uses can be setup without writing custom code. WVR responds to MIDI input, or to events on the GPIO pins. With the addition of a small backpack (SEEED XIAO) WVR functions as a USB MIDI Host, and can be connected to any midi controller.

• Playback up to 18 stereo wav files simultaneously, with ~1ms latency
• Configurable voice stealing algorithm to handle 18+nth triggers.
• Sample-accurate looping, with configurable loop start and end points
• Accepts virtually every audio file format, at any resolution, and any size, including wav, mp3, ogg, acc, flac, pcm, aiff, and many more
• Upload audio, map samples to MIDI notes, configure pin functionality, apply FX, manage firmwares, etc, all over WiFi
• Holds over 12 hours (8 GB) of stereo audio, at 16bit 44.1kHz resolution
• Optically isolated MIDI input, provides to-spec MIDI input implementation without any additional circuitry
• 14 GPIO pins, 8 of which can be analog inputs, and 4 of which can be capacitive touch inputs, plus the many peripherals available on the ESP32 .
• Pins can be set to start/stop samples, change bank/voice, turn WiFi on/off, mute/unmute, via Web UI
• Write firmware in Arduino, and upload over wifi. Stores multiple firmwares onboard, selectable via the Web UI.
• Receive MIDI over WiFi from a DAW via Web MIDI in the Web UI
• Create multi-sampled instruments, with velocity layering easily in the Web UI
• Bulk upload sounds, or multi-sampled instruments
• Backup and restore the contents of memory including configuration (handy for mass production) via Web UI
• onboard Ultra Low Power (ULP) co-processor means WVR consumes only ~10uA in sleep mode
• See the documentation for full list of features

technical specs:

• SoC : ESP32 WROVER-B
• Dual core Tensillica 240 mHZ processors
• 8 GB eMMC storage
• 16 MB flash
• Wi-Fi 802.11 b/g/n
• Bluetooth v4.2 BR/EDR and BLE
• Onboard peripherals for 12-bit SAR ADC, SPI, i2s, i2c, UART, SD, SDIO, CAN bus 2.0, IR, PWM (motor or LED), Hall Effect Sensor, ULP analog pre-amplifier
• ~60 mA typical power consumption, ~250 mA with wifi/bluetooth radio active, ~10 uA in Sleep Mode
• 1 channel of opto-isolation and level shifting for MIDI or 5v serial input
• 14 GPIO (8 analog input, 4 capacitive touch sensor pins)
• PCM5100 DAC provides up to 192kHz 32bit stereo audio output, at line level, but with enough power to drive headphones
• Ultra Low Power co-processor
• Castellated edges, one-sided PCB design, so can be used as a SMT device
• Power via micro USB connector, or from a regulated 5v or 3.3v input on pins
• Boot from flash, or from eMMC, featuring a recovery mode to bypass custom code.