4ms Company Dual Looping Delay User Manual - Page 17
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Time Down: Reverse/Hold Gate/Trigger and External Clock De-jitter
Reverse/Hold jacks Gate/Trigger input:
Gate/Trigger input for Reverse jack: Tap Reverse to toggle mode (lit=gate, unlit=trigger)
Gate/Trigger input for Hold jack: Tap Inf. Hold to toggle mode (lit=gate, unlit=trigger)
The input jacks for Reverse and Inf. Hold can be set to toggle the state when they receive gates or
triggers. In Trigger Mode, it will toggle every time a trigger is received. For example, the first time the
Reverse jack receives a pulse, Reverse will turn on. The next time it receives a pulse, Reverse will
turn off.
In Gate mode, the feature will toggle states every time the jack toggles states. For example, if you send
a gate into the Reverse jack, Reverse will turn on when the gate goes high and stay on until the gate
goes low (at which point Reverse will turn off). Pressing one of the buttons in either mode will always
toggle the state. Additionally, in Gate Mode, pressing the button will toggle between whether a high gate
= On or a low gate = On. This effectively inverts the gate signal.
Default is Trigger Mode.
External Clock De-jittering:
Hold down Ping while turning Time to 1, 4, 8, 12, or 16 to set the ECD algorithm:
Time at 1: Ignore clock pulses that deviate by 0.2ms or less. Ping will periodically flash once.
Time at 5: Ignore 1% deviation or less. Ping will periodically flash twice.
Time at 8: Accept all clock pulses (ECD Disabled). Ping will periodically flash three times.
Time at 11: Moving average of the past 2 clock periods. Ping will periodically flash four times.
Time at 16: Linear average of the past 4 clocks. Ping time only updates every 4 clocks. Ping will
periodically flash five times.
The Looping Delay has a very precise and jitter-free internal clock (less than 0.0001% at 120BPM). If
ever possible, it's recommended to use the Looping Delay as the master clock. However, using
external gear to clock the Looping Delay is also possible. One problem with using external clocks is
that lots of equipment generates clocks with a lot of jitter. Sometimes the tempo may vary by as much
as 2-3BPM. Since the Looping Delay is always recording things to be played back in the future, if the
tempo changes from when the audio was recorded to when it plays back, it will sound out of time. In
order to compensate for this, the Looping Delay has five algorithms that each work with different
types of external clock jitter.
If you need to use an external clock that has jitter, it's recommended you patch a simple patch and try
each of the five algorithms to see which one suits the particular type of jitter and your patch. Note that
in the case of the two Averaging ECD settings, adjusting the external clock speed will cause the
Looping Delay to slowly "catch-up" before "locking-on".
The default setting is Ignore 1% deviation. With drifting analog clock sources, Linear Average of 4 is
recommended.
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