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Low Pass – filter output.
Band Pass – filter output.
of the external audio input jack and EXT
High Pass – filter output.
(input) socket.
Envelope signal derived from the EXT
(output) signal – a control voltage
that represents the loudness of the
Modulation – pitch
incoming signal.
control input. Attenuate
Can be used as a modulation source.
input signal with the
Use the EXT (input) in the filter section
modulation slider.
of the EXT (input) jack as input for
Normalized to the VCO0
the EF.
+ VCO1 + external signal
mix. Connect another
, VCO1
signal to the socket to
partially override the
VCO1
waves. Especially useful for
normalization.
filter modulation.
Control Voltage – direct
pitch control input (no attenuator).
directly to the final output mix
Connect an external
(post filter).
signal wave to reset the oscillator waveform.
Square wave output.
Triangle wave output.
Track&Hold is a circuit that watches
a modulating voltage (CV or audio),
then either passes that signal directly
to the output (tracks – GATE HIGH)
or holds the voltage at a steady level
(holds – GATE LOW). It is primarily used
as a pseudo-random stepped voltage
Outputs looping sequences of
source.
stepped voltages.
Normalized from the band pass
filter output. Connect signal to override
normalization
LP (output) -
EXT (output) -
BP (output) -
HP (output) -
EF (output) -
VCO1 – Voltage Controlled
Oscillator 1
MOD (input) -
+ EXT (output) -
(output) -
CV (input) -
AUX (input) -
SYNC (input) -
T&H Track and Hold
(output) -
(output) -
OUT -
IN -
See pages "Let's record a pattern" for more info
on recording and using patterns.
External signal. Mix
Normalized to VCO1
square wave output. Connect signal
to override normalization.
Envelope Follower.
Modulating voltage output.
A mix of VCO0
HIGH =
and the EXT input signals.
TRACK
A mix of VCO0
+
Patch signals
LOW =
HOLD
• By default, the T&H is gated by VCO1.
Adjusting the VCO1 modulation slider
will change the shape (pulse width) of
VCO1 and dramatically impact the T&H
behavior.
• Slide the VCO1 modulation fader
all the way up to achieve a classic
Sample&Hold effect.
• Slide the fader down to introduce
unstable states, and feedback.
• Try patching T&H OUT to VCF
Patchbay
GATE (input) -
OUT -
See diagram below.
*Tech notes*
IN
GATE
OUT
This section is located on the back of the
housing and is for advanced users who
want to reconfigure the functionality
of their softPop. If you are new here,
then leave this section alone and
enjoy the deep weirdness of softPop
as it is. With the help of the secret
MOD.
THE SECRET CHAMBER
chamber, softPop can be turned from
a semi-modular into a fully modular
synth – where patch cables are required
The ATTINY85 is a little microcontroller
to produce sound.
that analyzes VCO0 and VCO1 and
outputs two variable voltages. One goes
directly to the pitch CV input of VCO0
and the other is available in the patchbay.
At its core, softPop is a fully modular
The connectivity is relatively simple
synthesizer. Several connections have
and the code is open-source. If you are
been made throughout the system to
interested in writing your own, you can
give it a specific personality, but if these
find diagrams and code online at bastl-
connections are broken, then the system
instruments. "github"
can be reconfigured any way the user
likes. I happen to like the way the system
is configured;) but for those who know
what's up, here are some switches that
you can use to make or break the pre-set
normalizations.
VCO0 <- TRACK&HOLD.
VCO1 <- VCO0
+ VCO1 inverted
+
EXT jack and socket.
VCF <- VCO0
+ VCO1
.
T&H SIG <- VCF BP.
T&H GATE <- VCO1.
PATTERN -> VCO0 CV (input).
Patchbay
ATTINY85 (pattern
generator and quantizer)
NORMALISATION
SWITCHES
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