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Bastl InstrumentsSKU: 1019174

Sale price$769.00
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The Bastl / Casper Softpop SP2 is a radical subtractive synth under the influence of unconventional digital control. It’s a rare beast that excels at both melody and noise in equal measure.
SP2’s favorite sounds include bassline bangers, angelic chord progressions, distorted beats, and water droplets. Softpop also has an external input with enough gain and saturation to process any sound thru the filter and VCA 

The heart of SP2 is an analog, modular synth replete with lush tones and a chaotic disposition. Its brain is a complex digital sequencer and quantizer that brings (some) order to the chaos. The analog heart and the digital brain support each other while also pushing their behaviors out of normal routines in surprising ways. 

SP2’s sequencer is built around simple 8-step loops of notes, gates, and slides called PATTERNS. These PATTERNS (8 per BANK) can be played and chained in any order (and in real-time) to create longer sequences. Softpop's sequencer expands on this classic format by adding 8 SCALES of user-definable quantization, 8 playback modes, and 8 performance FX, all of which can be independently chained and looped. 

Use the SCALE chaining to build chord progressions or reach for playback modes to browse the 8 steps in different ways. Add randomness and modulation to the pitch with the PITCH MOD fader and transpose the sequence with the PITCH fader. Temporary FX can be played on the fly to help you build transitions or looped for yet another degree of sequenced complexity. 

Softpop SP2 is a powerful analog sound processor! 

Plug any external audio signal into the SP2 to radically transform its sound with the built-in filter, VCA, and overdrive. Create stepped modulation with the sequencer and auto-wah style effects with the input-tracking envelope follower. Randomize it all with the sample & hold and use the 37-point patchbay to dive into the modulation madness. 

Here are a few possibilities for SP2 signal processing:
modulated overdrive, stepped filter, auto-filter (auto-wah), random filter, audio-rate modulated filter, resonant distortion, feedback distortion, MIDI-synced slicer, sequenced ring-modulator, MIDI-controlled ring-modulator, compressor/expander, and plenty more to be discovered. 

Softpop has a unique voice that reaches beyond classic subtractive timbres. It is playable by MIDI, and for all the sequencing fun, it features a quantizer with 8 user-definable SCALEs that can also be set by MIDI. SP2’s analog triangle core VCO has a built-in automatic digital tuning feature so that your melodies will be in tune in all octaves in just a few seconds. 




Fully analog signal path with integrated digital control 

Patchbay with 37 eurorack compatible patch-points for ultra-flexibility 

Light orb for psychedelic inspiration


Triangle core oscillator with PWM input and pulse and triangle outputs 

Automatic oscillator tuning and octave-wide fine-tune control 

Quantized V/OCT semitone transpose 

State variable resonant filter with lowpass, bandpass, and highpass modes 

POP control for unique subtle and distorted timbres 

Flexible attack-decay cycling Envelope with a ton of control inputs 

Drone or envelope mode switch for the VCA


Musical sequencer with a lot of tricks 

8 step sequencer with pattern chaining to extend the length 

Sequenceable scale quantizer with 8 user-editable scales 

8 patterns per bank, 8 banks (saved on demand) 

Envelope gates per step 

Slide option per step for that acid feel 

Playback modes will turn your simple patterns on their head 

Temporary FX section (ratchets, arps, noise, and more) 

CV, gate, and clock outputs from the sequencer


External input for processing audio with dynamics analyzer 

Analog sync Input 

Tempo section with divider/multiplier 

MIDI input for sync and musical control 

XY crossfader utility section and 4-way multiple for advanced patches 

What’s in the box 

Softpop SP2 

Quickstart guide 

5 patch cables (15cm: Green, Dark Green, Brown, Black and White) 

Micro USB cable (excl. power supply) 

Rubber feet 


Technical details 

USB power (micro): <250mA 

dimensions: 173 x 112 x 41 mm 

inputs are capable of receiving eurorack signals 

16-pin protected eurorack power connector requires 5V from busboard: <250mA 

eurorack size rail adaptors available as open-source files 

all outputs are 5Vpp except for PULSE, EDGE, ENV, BP, and DYNAMICS that are 4Vpp 


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