- 1 Troubleshooting
- 1.1 My patch is crackling, what's wrong?
- 1.2 My ER-301 won't start any more
- 1.3 The outputs are not producing any signal
- 1.4 My ER-301 keeps rebooting repeatedly
- 1.5 I hear hum or digital noise
- 1.6 My ER-301 keeps crashing
- 1.7 I hear clicks in the audio
- 1.8 The knob is not working
- 1.9 I am experiencing low bit-rate audio playback
- 1.10 I hear aliasing on the inputs
- 1.11 CV inputs stop responding until reboot
- 1.12 Sudden reboot when I touch the knob
My patch is crackling, what's wrong?
Most likely CPU usage is spiking over 80% but too briefly to show on the CPU load screen. The CPU load screen samples the load once per second so it can easily miss short spikes in CPU usage. I've tried to build all units so that their CPU usage is as constant as possible, except for one unit: Manual Grains. That unit's CPU usage will depend on the number of simultaneous grains playing at any particular moment (from 0 to 16) which will depend on the interaction of grain duration and grain triggering.
My ER-301 won't start any more
Did you recently use the ER-301 without screwing it to your rails and then as a result it fell in between the rails while your case was powered? In that case, you have probably electrically damaged some components. Repairs will be necessary. Please contact me for support.
Another possibility is that the firmware on your rear SD card has become corrupted. Please follow the Advanced Update Procedure:
If the ER-301 will still not start it is possible that your SOM has failed. Please contact me for support.
The outputs are not producing any signal
If the suggestions in the following forum thread do not work contact O|D for diagnosis and repair
My ER-301 keeps rebooting repeatedly
The reboot loop means that your PSU is not providing enough power to your ER-301.
Please refer to the wiki section on Power and make sure your ER-301 is receiving enough power.
I hear hum or digital noise
Modular power is not the cleanest. The average modular case will have a noise floor of about -90dB. You can do better but it takes work, money, and know-how. Another (very common) reason you might hear noise on the ER-301 outputs is improper gain staging. Modular outputs do not need amplification, in fact they should be attenuated! For example, if you are recording the output of the ER-301 then you should set the input gain that uses the entire output range of the ER-301 like this:
- Play a 1kHz full-scale sine wave from an output of the ER-301. Full-scale means that it swings from -1 to 1 without clipping.
- Plug this output of the ER-301 directly into a LINE input of your audio interface. Make sure any settings like Hi-Z or "instrument gain" are disabled.
- Set the input gain of your audio interface such that the sine wave from the ER-301 just about clips and reduce about 2dB from that point.
This procedure insures that you are using the full range of both your ER-301 and your audio interface thereby giving you the lowest noise floor possible. You should never touch this input gain when recording. If you need more gain (say for example you are playing a very quiet sound from the ER-301) then apply the gain INSIDE the ER-301 not after it. In general, amplification of quiet sounds should applied as closely to their source as possible NOT at the final stage.
My ER-301 keeps crashing
If you experience a crash with the latest stable firmware release then please make a bug report on the forum providing as much detail as possible including the steps required to make the crash happen again.
If you experience a crash using the latest bleeding edge release first make sure you are running the latest version as regular updates are made that resolve these errors. If the crash keeps happening even though you are using the latest firmware please make a bug report on the current firmware release thread where you downloaded the firmware.
I hear clicks in the audio
Check to see if your CPU usage is too high.
If your CPU usage is reasonable it is possible that you have found a bug.
The knob is not working
It is possible that the encoder is broken, please contact O|D for support.
I am experiencing low bit-rate audio playback
After leaving the ER-301 powered on for several hours or overnight, some users report low bit-rate audio playback.
The cause of this is still unknown and every effort is being made to track the source of the problem.
I hear aliasing on the inputs
In some cases it is possible to hear some aliasing on the audio inputs. This is a known issue and is being investigated.
CV inputs stop responding until reboot
The inputs stop working after a period of time indicates there may be a hardware fault.
Refer to the thread reporting this issue and if none of the suggestions work please contact O|D for support.
Sudden reboot when I touch the knob
Static electricity is building up on your body somehow, then when you touch the metallic knob on the ER-301, the resulting discharge disrupts the internal power regulator causing a reboot. The solution is described in this post on the forum.