Instruction Manual The Midiverb connects easily between any line-level sig- nal source and any . ranty repair to ALESIS or an authorized ALESIS warranty. REVERBS. Chorus-Reverb-Delay-EQ. Small Bright Room 1. Small Bright Room 2. Small Warm Room. Small Warm Chamber. ALESIS. MidiVerb 3. Reference Manual SECTION 1. MIDIVERB III QUICK START. The Alesis MIDIVERB III is a high quality multi-effects unit which.

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There’s not much ‘analog’ in this box, I must admit, but I was just wondering why it sounds so much better than the later MidiVerb III.

MidiVerb II is an amazing machine – midivsrb the era of cheap silicon and huge memory chips it’s still being used widely after 20 years or so in existence. I tried to google for schematics, service manual and a datasheet for the DSP chip.


And came back with nothing so I had to open the box and take a closer look. Here are my findings based on observations, measurements and some speculation about what’s going on in MidiVerb II.

When MidiVerb II is switched on the first program in the mapping table is read and activated. Actually only bytes required to store a DSP program are addressable. DSP handles one sample at a time. The instruction sequence DSP program consisting of bytes is continuously fetched in loop at 8 MHz clock speed from Program store SRAM so that the aoesis program gets executed during one sample cycle This results in 15KHz bandwidth for the processed audio signal after Digital-to-Analog conversion.

Alesis MidiVerb 4 Manuals

Processed signal is mixed with the ‘dry’ one in analog after the conversion MIX button. This memory consisting of memory locations is only visible to the DSP.

Although the pot for manuxl is easily accessible I have no idea how to do this procedure as it would require sending values alesls and down to the DAC but only the DSP can do this so you’d have to grab direct control over the DSP There is no dedicated ADC device involved. Analog-to-Digital conversion is managed by method of ‘successive approximation’.


Datasheets for more ‘interesting’ chips, as well as the user manual and program chart can be downloaded below.

All comments, clarifications, corrections, rectifications, amendments and revisions are warmly welcome here. None that I know of worth checking: Trimpot for MSB error adjustment procedure.

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