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# Mountain Sight BP2668Dx MIDI Controller and USB Audio Interface Combo Solution
For desktop producers and gigging keyboardists, a MIDI controller plus a separate audio interface means two USB cables, two power adapters, and two manuals. Combo products that fold both functions into one box have become the obvious choice for portable rigs — but they are hard to build. The conventional architecture pairs an MCU for keybed scanning and MIDI messaging with a separate USB audio codec, which doubles the BOM, complicates firmware coordination, and risks clock-domain drift. The MVSILICON BP2668Dx collapses both roles into a single QFN68 chip.
The BP2668Dx integrates a USB 2.0 HS OTG controller that carries audio streams and MIDI messages over the same port. A single chip replaces the MCU-plus-codec pair: one firmware image, one clock source, and no inter-device synchronization to debug. On the control side, 39 GPIOs scan a 61-key-class matrix along with rotary encoders and pad switches; the 30-channel SAR-ADC reads analog control voltages from pitch wheels, modulation levers, expression pedals, and joysticks; the on-chip RTC supports arpeggiators and timestamping. Control data and audio converge inside one chip, cutting cost, board area, and idle power in the same stroke.
A combo device should not mean compromised audio, and the BP2668Dx holds that line. Four 32-bit ADC channels with SNR of at least 105 dB accept stereo line inputs or a dual-channel microphone preamp stage, while four DAC channels at 112 dB or better SNR are allocated two ways: main outputs plus a low-latency headphone cue mix. Creators can play, record, and monitor inside one device without routing audio across boxes. These figures are competitive with entry-level standalone interfaces, so the combo form factor no longer trades quality for convenience.
The same chip also opens the door to wider product lines. Bluetooth 6.0 dual-mode supports companion apps on phones and tablets for sound-set switching and mapping configuration. A private 2.4 GHz link with sub-5 ms latency provides the technical base for wireless keybed or wireless monitoring products. An integrated CAN controller addresses multi-device setups: several controllers can be daisy-chained over CAN and managed by one master, freeing USB ports on the host computer. USB, Bluetooth, 2.4 GHz, and CAN on one die let a common core board spawn desktop, portable, and wireless SKUs while amortizing development cost.
Q: How does the BP2668Dx deliver MIDI and USB audio at the same time?
A: Its USB 2.0 HS OTG port carries audio streams and MIDI messages over one cable. The keybed matrix is scanned through GPIOs and analog controls through the SAR-ADC, then both MIDI data and audio travel on the same USB connection — no second MCU, unified firmware, and a single shared clock.
Q: Are 39 GPIOs enough for keybed matrix scanning?
A: Scanned as a row-column matrix, 39 GPIOs support a 61-key-class keybed together with rotary encoders and pads, with pins left over for LED indicators and function switches. Matrix scanning runs on hardware timing and leaves chip resources free, so larger keybeds still have PCB routing headroom.
Q: Can multiple combo units be linked on stage?
A: Yes. The integrated CAN controller lets several devices connect in a chain managed by one master, which handles timing and message routing. This suits multi-keyboardist stages or classroom labs, and removes the need for each unit to occupy its own USB port on the host computer.
Shenzhen Liwei Electronic Technology Co., Ltd specializes in audio PCBA development and design, with over 10 years of experience serving 15+ well-known brands and 300+ customers. We provide complete turnkey solutions based on the MVSILICON BP26 series — from schematic and layout to mass-production testing. Request a Quote for your custom MIDI controller and USB audio combo solution.
Shenzhen Liwei Electronic Technology Co., Ltd specializes in audio PCBA development and design with over 10 years of experience, serving 15+ well-known brands and 300+ customers. We deliver turnkey MVSILICON BP26 solutions from schematic and layout to mass-production testing.
Keywords: MVSILICON BP26, BP2668Dx, MIDI controller, USB audio interface, combo solution
