via this auction
You can find demos of a Firstman SQ-01 in previous posts here.

Key Features:
Retro Synth Magic: The SQ-01 offers a nostalgic appeal, blending a monophonic synthesizer with a built-in sequencer. Relive the essence of classic bass synth tones reminiscent of the legendary Roland TB-303.
Sequencer: Equipped with the digital keyboard sequencer, you can create up to 4 patterns, unleashing your creativity in crafting mesmerizing sequences.
Intuitive Interface: The SQ-01 boasts a single-octave, 13-note capacitance (touch) keyboard painted onto its main panel, allowing for tactile and expressive control over your sound.
Sound Sculpting: The synthesizer section features intuitive knobs for tuning, fine-tuning the single VCO, and controlling the cutoff frequency and resonance for the filter. Customize your sound with ease.
Versatile Envelope Generation: Choose between ASR or AR envelope modes, and precisely set the release time and sustain level using dedicated knobs. A master volume knob puts you in full control.
Vintage Synthesis Revived:
The Multivox Firstman SQ-01 encapsulates the spirit of vintage analog synthesis, delivering characterful bass sounds and captivating sequenced melodies reminiscent of yesteryears.
Rare Collectible:
This quirky and sought-after bass synthesizer is a rare find among collectors and synth enthusiasts. Act swiftly to claim your piece of synth history and add a unique charm to your music production.
Unleash Sonic Exploration:
With the Multivox Firstman SQ-01, you have the power to dive into sonic exploration. Create captivating basslines, intricate sequences, and immerse yourself in the versatility of this charming synthesizer.
Condition and Authenticity:
The SQ-01 is in excellent condition, preserving its vintage allure and functionality. Meticulously tested to ensure top-notch performance, it is ready to embark on new musical journeys with you."