dzielenie sygnału ---<

[Burning]

cytat z User Guide:

ISA One can be used to record an instrument and a mic or line signal simultaneously. This is because, with MIC or LINE selected using the INPUT switch on the front panel, an instrument connected to the DI Input will still be fed to the DI O/P (on the rear panel) and to the ADC (if installed and nothing is connected to the EXT I/P).

For example, a recording setup that uses this could be one where a guitar player and vocalist are to be recorded at the same time. In this instance, the vocal would be recorded using a microphone connected to the MIC XLR Input on the rear panel, with MIC selected using the INPUT switch on the front panel. This signal is then sent to a recording medium using either the MAIN O/P on the rear panel or an output on the optional ADC (if installed).
At the same time, the guitarist could be plugged in directly to the DI Input on the front panel. The guitar signal (now balanced and with lower output impedance) can then also be sent to a recording medium, this time from the DI O/P on the rear panel.

If only wanting to record guitar then this 2-channel facility can be used in a similar way. Only, in this instance, the AMP Output on the front panel is used to feed the direct instrument signal back into the amplifier, and the microphone is used to record the amplified guitar. This way, the clean direct guitar and the amplified guitar can be recorded on separate tracks (see diagram 3 in the Signal Connections section).

Z resztą "izę" bardzo polecam, używałem jako DI przy nagrywaniu Homo Hereticus.