Boss ME-30 (1997)
Six AA batteries, a metal chassis, and a signal chain that does the work of a pedalboard worth several times the money.
Overview
The Boss ME-30 arrived in August 1997. Pick one up and the weight is the first thing you notice: 1.5 kg with the batteries in. That's not a lot by pedalboard standards, but it's dense for something running on six R6/AA cells. It measures 305 mm wide, 205 mm deep and 55 mm tall, roughly the width of a Twin Reverb's control panel. This is a floor unit meant to be the whole floor rig, not a stompbox you add to a chain.
Boss built the ME-30 around a Delta-Sigma 20-bit ADC feeding a Delta-Sigma 18-bit DAC, running at a 44.1 kHz sampling frequency. In 1997 that was a current conversion spec, the same generation of converters showing up in rack gear costing multiples of the ME-30's street price. The service manual treats the noise floor as a hard specification. With the inputs shorted, the main outputs are supposed to measure -88.0 dBm or below on a JIS-A or IHF noise meter, and the OD/DS circuit path is allowed to sit at -84.0 dBm or below. Overdrive and distortion circuits are where noise usually creeps in, and Boss put a number on it and required it in the factory test sequence.
The effect list is the reason people still hunt these down. The main effects block covers compressor, overdrive/distortion, equalizer/phaser, noise suppressor, delay, chorus/flanger/pitch shifter/tremolo, reverb, and a guitar amplifier simulator. They aren't isolated stomps. The ME-30 lets you stack them into a chain, which is the point of a multi-effects floor unit. A separate set of effects is assigned to the expression pedal: volume pedal, pedal wah, tremolo arm, and ring modulator. The tremolo arm and ring modulator are the odd ones out, and they date the unit to the late '90s. Nobody was putting a ring modulator under a foot pedal in 1985, and by 2005 it would have been a menu item buried three levels deep.
Patch memory is 30 user patches plus 30 presets, with manual settings available on top of that. Sixty slots sounds modest now, but the ME-30 was never a preset-surfing machine. The manual settings mode shows what Boss expected: players dialing a sound with the knobs and using it, with patches as a convenience.
The main input is rated at -20 dBm nominal with a 1 MΩ input impedance, standard high-impedance guitar territory. There's a separate AUX IN on a stereo mini jack at -10 dBm nominal and 47 kΩ input impedance, which is where you'd feed a CD player or drum machine to practice against. Outputs are L (mono) and R at -20 dBm nominal into a 2 kΩ output impedance, plus a stereo mini headphone jack. At 2 kΩ, the output is high enough that the ME-30 wants a proper amp input or a DI, not a long unbalanced run into a low-impedance load.
The display is a split arrangement: a 7-segment, 1-character LED alongside a custom LCD. It's a workmanlike interface, not a graphic display, and it assumes you'd learn your patches rather than read them off a screen.
Power comes from six AA batteries or an optional PSA-series AC adaptor. Current draw is 170 mA at 9V DC, which is thirsty for a battery-powered floor unit, so expect the alkalines to be a consumable, not a backup. The unit shipped with the English owner's manual (part SE000129), the Japanese manual (SE000130), and six alkaline AA batteries. The AC adaptor was optional and sold separately, so check for one when buying used, because a lot of these show up without it.
The ME-30 is not a modeling unit in the modern sense. The amp simulator is one block in a chain, not the centerpiece, and there's no USB, no preset librarian, no firmware updates. It's a fixed-architecture processor from the era when "digital" meant a specific set of converters and a specific set of algorithms, and you either liked what Boss voiced or you didn't.
The factory test mode is entered by holding the EFFECT ON/OFF key together with both PARAMETER keys while powering up. From there the unit runs through thirteen discrete checks: LCD and LED segments, every switch in sequence, DSP initialization, internal RAM, external RAM, output frequency response at 20 Hz, 1 kHz, 5 kHz, and 15 kHz, output stage muting, the OD/DS circuit, input frequency response, the AUX circuit, residual and shock noise, OD/DS residual noise, and the noise suppressor and tuner. The frequency response test requires each of those four tones to land at -20 dBm ± 1 dBm, with no more than 1 dBm difference between channels. That's a tight window, and Boss specified it as a pass/fail gate.
The component list in the service manual is a roll call of late-'90s Japanese analog support parts: µPC4570 op-amps, NJM2100M, M5218AFP, NJU7201U-32 and M5278L05M voltage regulators, a GP2S24B photo coupler. Nothing exotic, nothing unobtainable. That's good news for anyone keeping one running in 2026.
The available documentation doesn't say where the ME-30 sits in the collector market. There's no pricing data in the source material, and no owner-reported failure patterns. What the spec sheet does show is a floor unit built around a fixed signal chain, powered by batteries, with a service manual that treats noise floor and frequency response as contractual obligations.
Similar items on eBay
No exact Roland Boss) ME-30 listings are live right now — these searches show current Roland and similar vintage synth gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.