MATRIXSYNTH: ARP Axxe Mono Synth with Mods SN 1623

Saturday, February 22, 2014

ARP Axxe Mono Synth with Mods SN 1623

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"This Axxe has had some very usefule modifications. The print layout of this version of the Axxe caused a fairly large bleed from the noise-source output which has been reduced by adding a wire to rerout the noise-source. This Axxe has the 4075 filter module that ARP used in many different synthesizers. Sometime during the design phase, a resistor value was miscalculated; as a result, the 4075's cutoff frequency will not sweep up as high as ARP really wanted it to. This may be partially responsible for the commonly held view that ARP filters do not sound as "snappy" as Moog filters. Timothy Smith designed a modification which will allow the cutoff frequency to sweep up as high as ARP meant it to. The mod simply involves changing four resistors on the board from 4.7 to 2.2K. This Axxe has the mod and there was a very noticeable improvement in sound. There have also been two switches added. The first switch was added to disable the extremely irretating LFO reset function. When the switch is engaged the the LFO free-runs which is very useful for legato runs. The second switch when engaged disables the ADSR retriggering which is standard on Arp synths. The Moog synths use single triggering of the ADSR which is necessary for playing legato runs. Finally the irritating RCS type jacks have been replaced with switchcraft 1/4' jacks..."

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