The ISLA Instruments Caladan Is an expandable 8-part analogue / digital multi-timbral desktop synthesizer module boasting multiple synthesizer engines by way of voice cards. Sharing much of its DNA with Isla's S2400 desktop sampler and the Futuresonus Parva MPE Synthesizer, released in 2015.

Without any voice cards installed, the Caladan has its own internal digital synthesizer engine with playback capabilities of Soundfont (.sf2) and SFZ multisample formats, with the added benefit of being able to run a (possibly multiple) plugin based synthesizer (VST, LV2, CLAP formats). Isla's target for this is 32-Voices (subject to change).

Voice Cards

Caladan has internal slots for up-to 8 voice cards, accessible via an easy access 'trap door' underneath the unit. Said cards are able to be essentially any type of synthesizer, be that pure analogue, digital or a hybrid of both. The voice card API will be open sourced with development kits made available, allowing other designers and developers to create synthesizer cards for use in the Caladan.

At launch, an improved version of the original Parva voice card will be available, the specifications of which are as follows:

Oscillators
3 Digitally-controlled analogue oscillators per voice
Sawtooth, triangle, and PWM waveforms
Variable-width saw waves
Tunable + / - 5 octaves
Hard Syncable
Independent level controls
Envelopes
4 4-stage (ADSR) envelopes per voice
Exponential curves for punchy attack and natural decay
Linear mode also available
Loopable envelopes
Routable to >40 destinations
Modulation
4 LFOs per voice
Sine, sawtooth, triangle, and square waveforms
Random sample-and-hold
Stepped LFOs
Free-running or key-synced
Routable to >40 destinations
Polyphonic Aftertouch
Filters
2 configurable voltage-controlled filters per voice
24db or 12db low-pass or high-pass modes
12db bandpass mode
Self-oscillating
Filter FM

Further Cards
Additionally, Isla also have the intention of creating the following voice cards.

Dual OPL3 4op FM card with analogue filters / VCAs (already in development)
SEM / OB-X card (already in development)
Analogue Percussion card
Mini Moog card
SH-101 card
String machine card
TB-303 Card

More Specifications
MPE Support
RGB led rings (yes, you can change colours) enabling simultaneous viewing of parameters across different voices / cards per knob.
USB Host and Device ports, both class compliant for MIDI controllers.
Standard MIDI DIN In / Out / Thru
4 x independent CV & Gate inputs
8 x Stereo output busses
Main & Sub Mix outputs
High quality steel / aluminium enclosure, comparable in build / looks to the S2400 (and compatible with the same side panels for wood lovers)
Universal mains powered (100-250v AC)