Atlantis

Inspired by the architecture and sound of the classic Roland SH-101, the Atlantis—just like the 101—is quick to dial in rich bass and lead sounds; only now you have much more sonic territory to explore. Dual VCOs, Multimode VCF, VCA with Drive, and an ADSR envelope, all of the building blocks needed to expand or start making sound in your rack.

Deep Legendary Voice

The Atlantis is an analog, full subtractive synthesizer voice condensed into a single 40HP module that manages to be comprehensive without being cluttered or constrained. It gives you all the building blocks needed to start making sounds in eurorack (VCOs, VCF, VCA, and envelope), making it a great starting point or addition to a comprehensive system.

Features:

• 27 jacks for creative and complex patching options
• Cascaded 4-Pole multimode filter
• Primary VCO: triangle core with Hard Sync, Octave switches, Linear/Exp FM and PWM
• Modulation VCO: triangle core with Hard Sync and Link switch to connect pitch to primary
• Global modulation bus with four VCO waveforms, noise and S&H options
• Looping ADSR with range switch, manual gate, and external level (velocity) control.
• Three position output clipping circuit
• Header on back of PCB that allows it to be linked (normalled) to the Intellijel Metropolis sequencer
• Skiff Friendly

Reimagining A Classic

The Atlantis is inspired by the architecture and sound of the classic Roland SH-101. It has always been one of our favourite synths and we really liked how the seemingly limited architecture allowed for all sorts of creative and musically useful sounds to be easily generated. Just like the 101 it is quick to dial in beautifully rich bass and lead sounds but there is much more sonic territory to explore.

Instead of saw core VCOs, the Atlantis uses triangle core VCOs based on the Dixie, which respond much more musically to FM. The modulation oscillator can be used as an LFO or VCO in audio rates, and both track very precisely over eight or more octaves.

In the mixer section you can adjust the balance of the primary oscillator’s waveforms, including a sine wave which is normalled to the EXT IN jack. You can also patch in one of the modulation oscillator’s waveforms into this channel in order to operate the Atlantis as a proper two oscillator synth. The “LINK”switch enables the modulation VCO pitch to be set as an offset of the primary VCO. This is useful when using it as a stacked dual VCO or when you have the MOD VCO acting as the linear FM source for the primary VCO and wish to maintain the ratio.

The filter section is a Roland style cascaded 4-pole multimode filter with LP, BP and HP modes. The LP Boost switch engages a special mode useful for the LP that produces a much fatter and prominent sound that is not drowned out by resonance (unlike the original SH-101). The filter self-oscillates to produce a very clean sine wave which also tracks 1V/Oct. Between the Mod VCO, Primary VCO, Sub Oscillator and resonating filter it is possible to layer up to four different pitches at one time.

The envelope section is an ADSR with a dual range switch. It also can be set to a looping mode which can be gated on/off externally.

The output VCA feeds into a two level output clipping circuit that you can use to get a much ballsier/dirtier sound.

Summary of enhancements/differences over the SH-101 core:

• Discrete triangle core VCOs (with far better tracking and Hard sync)  instead of CEM based IC.
• Primary VCO has linear FM (not just exponential)
• MOD VCO can be linked to the primary VCO pitch CV.
• Modulation oscillator switchable from LFO to VCO
• Filter is multimode, 2/4 pole switchable and has a special LP boost mode
• Filter allows for selection of inverted ADSR mod source
• Mixer section includes an external source which is normalled to a sine wave
• Filter has built in soft clipping
• Envelope has looping option, re-trigger, and selectable time range
• Output VCA has a two stage clipping circuit
• Patch points for every synthesis section