jroo loop Manuel utilisateur
loop
by jroo
loop
is a frippertronics-style stereo digital tape loop, echo and delay module with
adjustable tape speed, play head position, feedback and audio levels. It has a
customizable loop length of up to 2.5 minutes.
Contents
- Overview
- Getting started
- Detailed functionality
- Knobs
- Lights
- Record Switch
- Jacks
- Erasing the loop
- Patch ideas
- Firmware updates & support
Overview
Knobs
in - level of audio input
speed - speed and
direction of tape (for both
recording and playback)
feedback - amount of
playback signal sent back
to incoming audio
dry/wet - mix between
incoming signal and
playback from tape
playhead - distance
between record head and
play head
Lights
green solid - play
indicator
green blink - on loop start
red - record indicator
alternating slowly - ready
for initialization
alternating quickly - erase
warning
Switch
record - used for toggling
recording and erasing the
loop
Jacks (-5V to 5V)
record - gate to toggle
recording
speed - CV to control tape
speed and direction
feedback - CV to control
feedback level
dry/wet - CV to control
dry/wet mix
in 1, in 2 - dual mono
inputs
out 1, out 2 - dual mono
outputs
loop
is modeled after tape loop systems where audio is recorded to and played back
from a tape that’s continually looping. Several interesting effects can be accomplished
in a system like this when the position of the play head, tape speed, direction, and
audio and feedback levels are modified.
loop
gives you manual and CV control over each
of these.
Frippertronics is a practice pioneered by guitarist Robert Frip utilizing a tape loop
strung between two analog tape machines, one to record the signal and the other to
play it back. This module acts as both.
loop’s
signal flow mimics that of a traditional tape loop system. As tape passes by the
position of the record head, the existing audio on the tape is erased and an incoming
audio signal is recorded in its place. The audio that is recorded to tape is played back at
the position of the play head. The audio signal from the play head can be mixed with the
incoming signal for output, or fed back and mixed with the incoming audio to be
recorded again.
The following sections will walk you through some of these effects and provide details
on
loop’s
controls.
Getting started
To follow along with the examples below put your
loop
in the following configuration.
We’ll call this the “default configuration”.
●set the audio input level to full by turning the in knob
fully clockwise
●set the tape speed to 1x by turning the speed knob
fully clockwise
●set the feedback level to zero by turning the feedback knob
fully
counterclockwise
●set the dry/wet mix to 50% by turning the knob to a
12:00 position
, pointing
straight up
●put the play head and the record head in the same position by turning the
playhead knob
fully counterclockwise
●set the record switch to
off (down)
●patch an audio source into the in 1 jack
●patch your audio out through the out 1 jack.
Set the loop length with the initial recording
When you first power on
loop
, the green and red lights will be alternating slowly. This
means that the module is ready to record the initial loop. Start by flipping the record
switch
on (flipped up)
and then, after five or six seconds, switching it
off (flipped down)
again.
While you were recording, both lights turned to solid. Solid red means audio is recording
to tape and solid green means the tape is playing. When you flipped the record switch
to
off (down),
the recording stopped and the red light turned off because it was no
longer recording.
The length of this first recording determines how long your tape loop is. During playback,
when the end of the loop is reached, it will immediately start again at the beginning and
continue looping until you stop playback or erase the loop. The length of this loop will
not change until you erase the loop.
You should now see a solid green light that quickly blinks every five or six seconds (the
length of your loop) and hear the audio that you recorded repeating on a loop. The quick
blink happens every time the loop starts over.
Change the dry/wet mix
Your dry/wet mix is currently set at 50% so you will hear both the incoming audio and
the tape loop being played at equal volumes. To hear just the incoming audio, turn the
dry/wet knob
fully counterclockwise
for a 100% dry (original, unprocessed) signal. To
hear just what’s recorded to tape, turn it
fully clockwise
for a 100% wet (processed)
signal. Keep it
fully clockwise
for now and listen to what’s on the tape as it loops.
Control the tape speed
Now that your loop is playing, change the tape speed with the speed knob.
Fully
clockwise
is 1x speed. Slowly turn it until it reaches
the 12:00 position (pointing
straight up)
. The playback will slow down, then stop and the green light will turn off.
You’re now at 0x speed and the tape isn’t playing. Continue turning counterclockwise
and the tape speed will slowly speed up again but in reverse.
Fully counterclockwise
is
-1x speed, or 1x speed in reverse. Play with different speed settings for a while. Notice
that as the speed changes, the pitch also shifts. When you’re ready, bring the speed
knob back
fully clockwise
to play at 1x speed.
Change the play head position
In traditional tape loop systems there are two “heads”, one that records audio to a tape
and another that picks audio up off the tape and plays it back. The
loop
module follows
the same principle. Audio is recorded to one part of the loop at the record head position
and audio is played back from another, the play head position. The playhead knob
determines how far apart record and play heads are. This controls how much delay
exists from when something is recorded and when it is played back.
The default position for the playhead knob is
fully counterclockwise.
Here, the play head
and the record head are in the exact same spot. This means that as soon as something
records, it immediately plays back. As you turn the knob clockwise, the play head moves
further behind the record head and increases the delay.
Turn the playhead knob
fully counterclockwise
and flip the record switch
up
to begin
recording. Because the record head and play head are in the same position, you should
hear the audio that you have patched in with no delay. What you’re actually hearing is
the immediate playback of what’s recorded on the tape. Turn the dry/wet knob to dry so
you’re listening to the dry input. Now set it to wet and notice that the audio is the
same. That’s because what’s being recorded to tape is immediately being played back
so it just sounds like live audio.
Now let’s play with the play head. Go ahead and stop recording for now (flip the switch
down
), make the dry/wet mix 50% (dry/wet knob at
12:00, pointing up
) and set the
playhead knob to
12:00, pointing up
. Start recording again. You’ll now hear your input
playing back again but this time with a delay. Setting the knob to
12:00
makes the
playback distance equal to half your loop length so the delay is half the time of your
total loop. If your loop is six seconds the delay will be three seconds.
Play with playhead positions to set different delay times. When you find a delay interval
that you’re happy with, set the dry/wet knob to various positions to change the volume
of the live audio vs. the delayed audio.
Add feedback
It’s possible to take the audio that’s being played from the tape and send it back to the
record head so it’s recorded again, creating a feedback loop. Turning the feedback knob
clockwise
increases the level of the audio that’s sent back to the record head. While
you’re still playing back the delay that you previously set, slowly increase the feedback
level and notice that the delay now repeats multiple times instead of just once and it
fades out over time. The more you increase the feedback level, the more times you hear
the repeated signal and the longer it takes to fade out. Turning the feedback knob
fully
clockwise
will result in the repeated signal never fading out and accumulating more and
more audio every loop. This can get crazy quickly! Especially if the playhead and record
head positions are close to each other. To tame the feedback, turn the feedback knob
back down (
counterclockwise
).
Erase the loop
To erase and reinitialize the tape, stop recording (record switch flipped
down
), set the
tape speed to zero (speed at
12:00
) then flip the recording switch on, then off, three
times. While flipping, the record and play lights will flash quickly to let you know that
you’re about to initialize the loop. To abort the initialization before flipping on and off
three times, stop flipping and wait two seconds. Once the loop is initialized, the tape is
erased and you can record another loop and set a new length.
Bring it all together
Now that you have a handle on recording, the dry/wet mix, tape speed, play head
position and feedback, play around with different combinations of each and see what
you can come up with. Once you feel like you have a handle on the manual controls,
bring CV in to toggle the record, speed, feedback and dry/wet settings. More patch
ideas can be found later in this document.
Detailed functionality
Knobs
In
The in knob determines how much of the incoming (dry) audio signal is passed to
loop.
Fully
clockwise
is 100%, full volume. Fully
counterclockwise
is 0% and no audio is
passed in.
Speed
The speed knob sets the speed of the tape. The speed of the tape determines the speed
at which the tape moves relative to the record and playheads. If speed is set to 1x
when recording then set to 0.5x on playback, what’s played back will sound twice as
slow and at a lower pitch. Alternatively, speed is set to 0.5x when recording and then
set to 1x at playback, it will move twice as fast and play at a higher pitch.
Feedback
The feedback knob determines how much of the signal that’s played back from tape is
sent back to be mixed with input to be recorded again.
Dry/wet
The dry/wet knob sets the mix between the incoming audio (dry) signal and what’s
played from tape. Fully
counterclockwise
is fully dry and only the incoming audio signal
is output. Fully
clockwise
is fully wet and only what’s played from tape is output. A
12:00 position (straight up)
sets an equal mix of dry and wet, meaning the incoming
audio and tape playback are output at equal levels.
Playhead
The playhead knob sets the position of the play head relative to the position of the
record head (or the
distance
between the record head and the playhead). This
determines how much time there is between when a signal is recorded to tape and
when it is played back. The knob sets the value relative to the length of the loop. If the
tape is moving forward (the tape speed is positive), fully
counterclockwise
will set the
playhead in the same position as the record head meaning audio will be played back as
soon as it is recorded. At a
12:00 position (straight up)
, the play head is half a loop
behind the record head. For example, if a loop length is six seconds and the tape is
being played at 1x speed, the playhead will play back an incoming signal 3 seconds
after it is recorded. Fully
clockwise
is a full loop length behind. Note: playback time will
be different depending on which direction the tape is moving.To understand this, look at
the “traditional tape loop system” graphic near the beginning of this documentation. In
this case, if the tape is moving forward, it will play back relatively soon then loop all the
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