If you use sequencer programs on your computer, deactivate the MIDI port used for the Modular in the sequencer program. Replace your MIDI cables. This may sound simple, but quite often the problem is only a broken cable. If it does, it's probably not a hardware problem. Install or reinstall your MIDI interface with the latest drivers.
Most manufacturers have drivers for download on their web sites.
The MIDI Tester will indicate if there is a problem with the MIDI Sysex communication. If you can't get the communication to work properly with your installed MIDI interface, even though you reinstalled it with the latest driver, it could be wise to try another MIDI interface. It's hard to recommend a specific MIDI interface that would work in every computer configuration. It is not possible for us to test every possible combination of computer, MIDI interface, software etc. Soft- und Hardware GmbH MidiMan interfaces in general, from MidiMan Note that we don't guarantee that the interfaces on the list above would work in every setup.