Routes and merges midi data between two USB devices and one TRS midi device
https://tubbutec.de/usb-bridge-a/
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INCLUDES ROLAND WM-1D BLUETOOTH MIDI ADAPTER Routes and merges midi data between two USB devices and one TRS midi deviceUSB Bridge A features two midi USB hosts and conventional TRS midi input and output.Midi data is routed between the connected devices and merged if necessary.Data received from a USB device will be send to the other USB device and to the TRS output.Data received on the TRS input will be sent to the two USB devices.Depending on the kind of data it will be merged, see below.You can use this to:Connect one or two midi USB midi controllers/keyboards to a conventional midi device Connect a keyboard to a module with only USB device capability Connect a cheap USB midi interface and get more conventional midi IOs Use your phone to control your Eurorack or as a synthesizer Merging and routingIf all three midi inputs are used (2xUSB, 1x midi TRS), it is necessary to route and merge midi data.Here, USB Bridge A differentiates between several types of midi data:Note and controller dataThese are all the midi messages that can be merged without any issues. If two devices send midi at the same time, data will be interleaved and sent to the receiving device.Clock DataClock data can not be merged, only one midi clock stream can be used at a time. When USB bridge A receives clock data, it will lock the receiver to this clock source. Once you press stop, the receiver is freed and clock data can be received from an other device.Sysex dataSysex data is even trickier to handle than clock data, because sysex messages can have an arbitrary length. if multiple sysex streams are received simultaneously, USB bridge A buffers the data and will forward it to the receiver as soon as possible. This way sysex messages are merged as well.LED indicationLEDs show the status of USB and midi:NO USB device connected: offUSB device connected successfully: greenReceiving midi: flashes yellowUSB device connected, but not compatible: redOvercurrent detected: blinks redTRS midi LED:Module is powered: LED greenReceiving midi: flashes yellowVoltage converterUSB bridge A includes an optional DC/DC converter to convert 12V to 5V. This means eurorack cases without a 5V supply are also supported. A jumper on the back selects between 5V or 12V input. The DC/DC converter topology means current draw is less on the 12V supply. For example: If your USB device draws 500mA, USB bridge A will only draw about 220mA from 12V.
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