Alesis Fusion 6HD (2005)
61-note semi-weighted keyboard workstation with 4 synthesis types, 8-track hard disk recording, and expandable sampling
Overview
The Alesis Fusion 6HD is a professional keyboard workstation released in 2005. It has a 61-note semi-weighted Fatar TP-9 keybed with velocity and aftertouch sensitivity, and it was built in Taiwan. Four synthesis engines share the box: Sample Playback, Virtual Analog, FM, and Physical Modeling. The virtual analog sounds come from the Ion, Micron, and A6 Andromeda. The hard disk recorder is 8-channel and 24-bit, with a 40 GB internal drive. Sequencing is handled by a 32-track MIDI / 8-track audio sequencer with 480 ppq resolution. A Coldfire processor with 7 DSPs runs it all, and the OS had reached version 1.24 by 2007.
Specifications
| Synthesis Types | Sample Playback, Virtual Analog, FM, Physical Modeling |
| Keyboard | 61-note semi-weighted (Fatar TP-9), velocity and aftertouch sensitive |
| Memory | 64 MB RAM (expandable to 192 MB) |
| Hard Drive | 40 GB internal, CompactFlash support up to 16 GB (with partitioning) |
| Recording | 8-track, 24-bit hard disk recording |
| Sequencer | 32 MIDI tracks, 8 audio tracks, 480 ppq resolution |
| Display | 240x128 backlit monochrome LCD |
| Connectivity | USB 2.0, S/PDIF, ADAT Lightpipe, MIDI In/Out/Thru, 8 analog inputs |
| Dimensions | 35.5 x 14 x 4 in (90.2 x 35.6 x 10.2 cm) |
| Weight | 30.4 lb (13.8 kg) |
Design
Inside, the Fusion 6HD uses a Coldfire processor surrounded by 7 high-performance DSPs. The main, digital, analog, and I/O boards are separate PCBs. The power supply is an internal switching type. The CCFL-backlit display is driven by its own dimmer and inverter PCB. The audio circuitry includes MC33079 quad op-amp ICs. Sampling is 16-bit at 44.1 kHz, with 11 minutes 53 seconds of record time using 64 MB RAM, expandable to 37 minutes 15 seconds. Alesis Fusion Converter software imports WAV, AIFF, Akai S-series, and SoundFont 2 files.
Context
The Fusion 6HD shares components and architecture with the Fusion 8HD, which has a weighted keyboard. Both models were part of Alesis' shift toward high-end workstations, away from their budget reputation.
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