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Dual Looping Delay
from 4ms Company

Eurorack Module User Manual 1.0b (2016-June-2)

For firmware version 4

The Dual Looping Delay (DLD), designed by 4ms Company and Gary Hall, is an advanced audio processor for 
creative synthesis. Not a tape or analog emulation, but a modern crystal-clear digital delay, the DLD combines 
features of delay, looping, and sample-tight synchronization for powerful and dynamic sound capture and 
modification. The DLD is designed to integrate seamlessly with modular timebase and sequencing devices such as 
the 4ms Quad Clock Distributor (QCD), etc.

•

Two channels, each with nearly 3 minutes maximum delay/loop time at 48kHz/16-bit (option for 24-bit)

•

Extremely quiet, low noise, low jitter design

•

Stereo, cascading, or dual independent mono use

•

Delay and loop time is sync-able to a clock, or a division or multiplication of a clock

•

Infinite Hold mode for looping and windowing

•

Reverse feature for toggling direction of playback

•

Feedback ranges from 0% to 110%

•

1V/octave tracking for Resonant Delays (Karplus-Strong)

•

Wet/Dry mix output, as well as dedicated Send/Return for feedback loop

•

CV and trigger inputs for all major features

Содержание Dual Looping Delay

Страница 1: ...essly with modular timebase and sequencing devices such as the 4ms Quad Clock Distributor QCD etc Two channels each with nearly 3 minutes maximum delay loop time at 48kHz 16 bit option for 24 bit Extremely quiet low noise low jitter design Stereo cascading or dual independent mono use Delay and loop time is sync able to a clock or a division or multiplication of a clock Infinite Hold mode for loop...

Страница 2: ...utput Buffer can be cleared with a button press 20HP Eurorack module Controls and jacks Channels A and B are identical and separate except for the common clock and audio normalizations Controls Ping button Tap a tempo to set the base clock one beat Base time can also be set by an external clock Time knob per channel sets the loop time in number of beats Ranges from 1 to 16 Time switch per channel ...

Страница 3: ...g jack The VCO should be in the low or mid audio range less than 2kHz 250 500Hz is ideal Feed a signal into the In jack noise works well so do triggers 10V triggers will resonant more 5V triggers are barely enough to trigger the resonance Use the Time switch and knob to set the Pitch Feedback sets the resonance which determines the amplitude of the pitch and Delay Feed effects the level and resona...

Страница 4: ...y the Ping button or jack Each channel can multiply divide or add to the base time by using the Time knob switch and CV Anytime the base time is changed by tapping the Ping button or changing the external clock both channels will instantly change tempo while maintaining the same ratio to each other Channel normalizations The main In A jack feeds into the switch tab of the main In B jack Therefore ...

Страница 5: ...de in portions of the signal onto the loop The knob and CV jack are added together and have a maximum combined value of 100 Negative voltage on the CV jack is ignored Note that in Inf Hold mode Delay Feed has no effect since there is no recording Feedback Also known as regeneration echo amount and other names feedback is a common feature on delay effects Feedback is the amount of signal read from ...

Страница 6: ...ily The loop is more dynamic and mutable versus when Infinite Hold is on the loop is more static and immutable Reverse Reverse reverses the direction that memory is read and written Pressing the Reverse button toggles Reverse on off when the button is released If you turn a knob while Reverse is held down the Reverse action will be cancelled this is because holding a button while turning a knob is...

Страница 7: ...oll back very far even more quickly than Tip 1 change the Time parameter to very long perhaps flip the time switch up to 16 Since turning Feedback Infinite Hold scrolls by one loop size making the loop size enormous lets you scroll by enormous amounts with just one knob twist You can scroll back a maximum of 2 minutes 54 seconds Tip 3 Set Time to a very short period and window around a loop with C...

Страница 8: ...atch a manual CV source into the Delay Feed B CV jack It can be a Pressure Points or an FSR pressure output or perhaps an envelope output that s triggered manually When you press on the Pressure Points or FSR you will bring up the Delay Feed parameter which causes audio to be recorded onto the loop Since Feedback is at 100 the loop is infinite and everything you lay down will remain but take care ...

Страница 9: ...k and use the Mix A knob to blend between the dry signal and Channel A s delay Reverb y echo room Patch as shown on the left Try setting one channel s Time to a fast delay such as 1 with the Time switch flipped to 1 8 Set the other Time to a slow delay such as 8 Set both channel s feedback amounts to around 75 90 Take the output from Out B Tap a very fast tempo as fast as your finger will go While...

Страница 10: ...ts Feedback with External Processing The classic use of Send and Return ports in a time delay processor is to provide a side chain for modifying the delayed signal before it is returned to the input mix Probably the most classic application of this kind of side chain processing is a simple low pass filter in the feedback path This causes succeeding repeats to soften with less high frequency conten...

Страница 11: ...e reset it back to the start and tap Reverse A button to reset The Hold A button should light up Play the file from the beginning again 6 If the file loads successfully the DLD will immediately start running In some cases you may need to do a Factory Reset see Factory Reset section Estimated late June 2016 the open source licensed source files in C for compiling with gcc arm can be found at https ...

Страница 12: ...pulse width In this mode the loop lights and Ping light will each blink once in sequence A short flicker means the associated jack is in trigger mode and a longer blink means it s in gate mode The associated button will also be lit to indicate gate mode or unlit to indicate trigger mode Gate Trigger output for Loop A jack Tap Reverse A to toggle mode Gate Trigger output for Loop B jack Tap Reverse...

Страница 13: ...switches up hold down all five buttons for 8 seconds Calibration Mode Your DLD has been calibrated at the factory and should not need re calibration Hardware hackers should be aware that the calibration data is stored in FLASH memory at 0x08004000 to 0x08007FFF If this sector is erased the DLD will automatically re calibrate itself on boot Make sure nothing is plugged into any CV jacks the first t...

Страница 14: ... disabled Clock outputs Main Loop A Loop B 0V to 8 2V 2 4µs maximum jitter i e 0 001 at 120 BPM Rise or Fall time 1µs Pulse Width Trigger mode 22ms Gate mode 50 square wave At clock speeds faster than 22Hz the clock output becomes 50 duty cycle Sampling 24 bit sample at 48kHz 32 bit processing 16 bit storage in RAM 256Mbit nonvolatile SDRAM chip for a maximum of 2 minutes 54 seconds per channel 6m...

Страница 15: ...t Gate Triggers for clock outputs Dim the loop LEDs Re assign Delay Feed CV jacks to Mix Enable disable auto mute and soft clipping Adjust 1V oct tracking No clicking when doing a Reverse or exiting Infinite Hold mode Exiting Infinite mode quickly crossfades to play from the beginning of the loop Fixed the loop lights so they display better at high speeds 15 ...

Страница 16: ...16 ...

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