High-speed USB MIDI HOST box (UMH-21) is a new generation of USB MIDI host box launched by DOREMiDi. This product has standard high-speed USB2.0, which has the characteristics of strong compatibility, fast transmission rate and high stability. The product has a firmware upgrade function and is perfectly compatible with all devices with a USB MIDI interface. The USB HOST interfaceof UMH-21 supports connecting to a USB HUB, and expands to connect more USB MIDI devices. It supports not only Class Compliant devices, but also non-Class Compliant devices. You just need to make sure that the device's USB port has MIDI capability.
Main Feature:
1. DC IN interface: Productpower supply interface, use DC plug to supply power to the product, powersupply voltage 5V~12V. (Center-positive power supply)
2. USB-A interface: Standard high-speed USB MIDI HOST interface (USB2.0), used to connect USB MIDI devices and supply power to the USB MIDI devices.
3. MIDI 5-pin interface: One-in and one-out 16-channel standard MIDI interface for high-performance FTP processing.
4. Indicator light: product power indicator light, USB working indicator light, MIDI output/output indicator light.
5. UpdateKey: Support firmware upgrade, compatibility upgrade for special MIDI devices.
6. High compatibility: USB Host Compatiblewith all USB MIDI devices USB2.0/USB1.0/USB1.1,MIDI DIN Compatiblewith all musical instruments with MIDI standard interface.
7.The UMH-21's USB HOST interface can be connected to a first-level USB HUB (up to 4 USB ports). USB HUB>>
8.Click the "Mode key" UMH-21 to switch to Merge mode/Normal mode:
High-Speed USB MIDI HOST(UMH-21)Instruction.pdf
Firmware Upgrade Instructions for UMH-21
Windows: DOREMiDi Upgrade tool for Windows.zip
MacOS: DOREMiDi Upgrade tool for MacOs.dmg
Note: For products purchased before October 2024, the firmware needs to be upgraded on a Windows PC. MacOS is not currently supported.
| Version | Firmware Download | Update Content | Update Target | Note |
| V2.3.5 | UMH-21 Upgrade instructionsV2.3.5.zip | Improve the compatibility of USB HOST when connected to USB HUB. | For users who need to connect more USB devices via a USB hub. | |
| V2.3.4 | UMH-21 Upgrade instructionsV2.3.4.zip | Improved compatibility of the USB HOST port, compatible with high-speed USB composite devices (USB MIDI + audio), such as the BOSS Katana Gen3. | Users need to use BOSS Katana Gen3 or a high-speed USB composite device. | |
| V2.3.3 | UMH-21 Upgrade instructionsV2.3.0.zip | Improve the compatibility of USB HOST port, and make it compatible with devices with built-in high-speed USB HUB, such as BOSS RC600. | Users need to use BOSS RC600 or the USB device may have a built-in high-speed USB hub. Products purchased in the online store before October 16, 2024, products purchased after that do not need to be updated | This firmware upgrades need to be performed on a Windows PC. |
| V2.2.6 | UMH-21 Upgrade instructionsV2.2.6.zip | Optimize the data communication when the USB HOST port is connected to the USB HUB. | Products purchased before December 29, 2023. | |
| V2.2.5 | UMH-21 Upgrade instructionsV2.2.5.zip | When the USB HOST port is connected to the USB HUB, the "Merge" mode can also be configured. Modify the Merge mode: Merge Mode1: Click the button and the MIDI OUT indicator light is always on. MIDI message direction: USB HOST → MIDI OUT MIDI IN → MIDI OUT MIDI IN→ USB HOST Merge Mode2: Click the button, the MIDI OUT indicator light will flash twice and stay on. MIDI message direction: USB HOST → MIDI OUT MIDI IN → MIDI OUT Note: In MERGE mode, if there are multiple USB MIDI devices through the USB HUB, it may cause too much MIDI messages in the MIDI OUT, resulting in delays or packet loss. Please use it according to the actual situation. | Products purchased in the online store before November 20, 2023, products purchased after that do not need to be updated. |
Firmware upgrade driver
If the computer cannot recognize the UMH-21 during the upgrade process, it may be that the computer is installing the driver. Please try to install the driver and then follow the firmware upgrade instructions.
Virtual COM Port Driver V1.5.0.zip
Other Versions Release Notes：
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