E-mu Proteus 2500

Back in 2001, this rackmount beast arrived as E-mu's most powerful Proteus yet, packing three times the processing speed of the 2000 and a massive 32MB sound library expandable to 128MB via ROM cards, letting you mix in orchestral, ethnic, or groove sounds from across their lineup.

It's a 4U powerhouse with 128-voice polyphony and 32-part multitimbrality, driven by sample-based synthesis where each of four layers per preset routes through Z-plane filters, three envelopes, two syncable LFOs, and a deep mod matrix with over 100 parameters. Hands-on control shines with 16 real-time knobs, 16 programmable trigger buttons, a two-line LCD plus LED display, mode/view buttons, and dedicated sequencer transport—perfect for tweaking on the fly or sequencing via its 16-track MIDI recorder supporting real-time, step, grid, and pattern modes. Audio flows pristine through six stereo analog outs and S/PDIF digital, all 24-bit, with USB for MIDI dumps and OS updates, standard MIDI I/O/Thru, footswitch ports, and an arpeggiator bank of 32 programmable patterns.

Users have long praised its intuitive interface for sound design and sequencing, calling it a rompler king that punches way above its weight, though some note the single MIDI In and basic effects as quirks of the era. If you're chasing vintage workstation magic without the keyboard bulk, this one's a studio gem.