Roland E 4 external instrument input tests

Various tests on the Roland E-4 are performed, to connect an external instrument and use it as an effect or looper.

There are a few things to consider and a few workarounds involved in getting this to work (more or less):
1) As explained on an article on the Roland blog, the splitter must be of CTIA type (not OMTP).
2) You have to set FORCE HEADSET to FORCE in the E-4 settings.
3) You have to plug something to the front MIC IN connector, otherwise you'll get no sound from the external instrument.

Keep in mind these are not the official guidelines for getting the external instrument to work; these are workarounds that I and other people have found empirically.

I don't know if the unit is faulty or not. But it seems most people have the very same issues.

Despite the workarounds above, sometimes the status of the external input will "reset", and you have to unplug and plug in the dummy jack at the front MIC IN.

Table of contents:
0:00 Basic cable checks: TRS stereo cable
0:30 Basic cable checks: TRRS splitter CTIA type
1:30 Mic check
1:41 External instrument input (no dummy jack)
2:02 External instrument input (with dummy jack)
2:24 External instrument input (after removing dummy jack)
2:40 External instrument input (mono cable)
3:05 External instrument input (split cable, cut 1 channel)
4:01 Issue when connecting and disconnecting cables
4:44 Note about settings