SA249 C4 Synth User Guide 45
Other equipment: Remove other effects from signal chain; see if noise persists.
Bad cables: Swap out audio cables.
USB ground loop: When connected to a computer using a USB cable, noise can appear in the audio
signal. This usually results from ground loop noise due to the True Spring and computer running on
separate power supplies. In the case of laptops, disconnecting the computer’s power supply and
running it on a battery can often mitigate the noise. External display monitors are often the primary
source of noise, and powering down monitors can also resolve noise issues.
Unit Appears Dead / No LEDs Lit
Effect is bypassed: Press the footswitch to enable the effect and see if the main LED turns on.
Wrong power supply: Use correct power supply. See the DC 9V (Power) section for more details.
Corroded power cable plug: Check power plug for corrosion on sleeve. Swap out power supply if
necessary.
Frequently Asked Questions
What kind of instruments can I connect to the C4’s inputs?
The C4’s audio inputs are high impedance (~ 1 MΩ). It can accept high impedance signal sources like
guitars/basses with passive pickups, as well as low impedance sources like line-level audio circuits,
guitars/basses with active pickups, electronic keyboards, or mixer outputs. The input circuit can
handle signals ranging up to 5.6 Volts, peak-to-peak.
Can I power the C4 directly over USB, without using the 9 Volt supply?
No. USB provides 5 Volts, but the C4 needs 9 Volts, so the pedal cannot be powered directly from
USB. Make sure that you have plugged in the included 9V DC power supply when connecting to the
True Spring’s USB port.
When connecting the C4 to a recording interface or mixer, should I used a Lo-Z
(microphone) or Hi-Z (line / instrument) input?
The C4’s output will be low impedance when the effect is active or in buffered bypass mode, but it
will be high impedance when using true bypass mode and a guitar with passive pickups. Therefore, it
is recommended that you use a high impedance (Hi-Z) input on your recording interface or mixer to
avoid signal loss.
Can I use the C4 in my amp’s effects loop?
The audio inputs can handle up to 8.2 dBu or 5.6 Volts peak-to-peak, which allows them to work in
most amp effects loops. In order to avoid clipping, be sure to check your amp’s documentation and
verify that the maximum send level is less than 5.6 Volts peak-to-peak.
How do I update the firmware?
Firmware updates are achieved using the Neuro Desktop Editor. Download the latest version of
Neuro Desktop Editor from the Source Audio Downloads page. Open the updated Neuro Desktop and
connect the C4 Synth to a computer using a mini USB cable. If the C4 is in need of an update the
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