Yamaha D1500
A 1023-millisecond digital delay with 16 memories - and, if the contemporary advertising is to be believed, the first one that listened to MIDI.
Overview
The D1500 is a 19-inch rack unit barely an inch and three-quarters tall, and it weighs 11.5 pounds. Yamaha's own product announcement in the period press laid out the pitch plainly: a high-performance delay system with 16 programmable preset memories, a delay range of 0 to 1023 milliseconds selectable in one-millisecond increments, and full 20 Hz - 18 kHz frequency response with what the copy described as exceptionally low noise and distortion. The suggested retail price was $895.
The range of effects was broader than the word "delay" suggests. Beyond straight echo, the unit covered flanging, doubling, chorus, vibrato, and slapback - a full rack's worth of time-domain tricks in one box. The 16 memory banks were numbered 0 through 9 plus A through F, with programs A through F preloaded at the factory. A player could get useful sounds out of it before programming a single patch.
Ten pushbutton switches along the right side of the front panel assigned the settings for each program. They governed time, feedback low-pass filter, feedback level, invert, mix, rate, wave, and depth, plus two switches for MIDI channel recall. That last pair is what set the D1500 apart. Yamaha billed it as the first MIDI-compatible delay system. Each synthesizer voice, up to 128 presets, could automatically select one of the D1500's programs or bypass the unit entirely. A keyboardist onstage could call up the right effect for a given patch without reaching over to dial anything by hand.
Whether the "first MIDI delay" claim survives scrutiny, the archive can't settle from period documentation alone, and manufacturer advertising is not an independent verdict. What is clear is that the MIDI implementation was the unit's calling card. Studio Sound (April 1985, p.77) put it directly: even without its MIDI capabilities the D1500 is a high-quality, versatile digital delay, but with MIDI, it's unique. That same review confirmed the headline numbers - a 1.023-second maximum delay, 20 Hz - 18 kHz response at the full delay setting, 16-channel MIDI availability, and comprehensive footswitch facilities.
By the time the British mail-order trade got hold of it, the pricing had turned. One dealer advertised the D1500 as "16 programmable delays with MIDI - not £639 but £299," and another listed it under Yamaha special offers at the same £299 against an RRP of £699. A third ad touted "16 memories + pass for instant recall via MIDI, 6 preprogrammed memories, full range of effects, max delay 1.023 sec, frequency response 20Hz to 18KHz." The gap between list and street price was big.
The D1500 turns up in period studio and stage rigs more often than its modest reputation might suggest. A DB Magazine (July 1986, p.18) equipment list from a working setup pairs it with a Yamaha Rev-7 reverb, a DX-7, a DX100, and a Tascam 244 Portastudio. That is a small-format keyboard-and-multitrack rig, the kind where a MIDI-addressable delay earns its rack space. A 1990 Mix listing still counts the D1500 DDL among available outboard, so the unit stayed in service well past its introduction.
For collectors, the appeal is narrower than for a synth or a tape machine. This is a utility piece - a black rack box whose value lies in what it does to a signal, not in how it looks on a shelf. The MIDI program-change behavior is the reason to seek one out, and the reason to be careful: a unit that has lost its memory battery or its factory presets is far less interesting than one that still recalls programs A through F on command. Verify MIDI recall and the preloaded programs before buying, since the whole design was built around them. The archive has no documentation on common failures, parts availability, or current market prices for this model, so treat any listing as an inspection-first purchase.
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