This 16HP Eurorack module re-imagines the Roland 100M module of 1978. It combines the 24dB OTA filter from the Jupiter 8 with the VCA from the 130, which has linear and exponential modes. The filter has Q compensation, 12 and 24dB modes and a resonance that goes to the edge of self-oscillation. Overview The AM8120 […]
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A 16HP Eurorack module which reimagines the Roland prototype of 1978, with a couple of twists. The VCO and sub from the SH-101, combined with the cascaded ladder filter from the Korg Monopoly. This module produces new sounds, completely different to the standard Roland OTA filter. Both VCO and VCF chips are manufactured by Coolaudio. […]
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Introduction One of the projects I worked with Behringer on during 2019/20 was the range of ARP 2500 clone modules, and one of the best sounding and most versatile modules is the 1047 Multi Mode filter. I bought a Behringer 1047 module in September 2021 to see how well the filter had turned out and […]
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14HP Eurorack module with a combination of high-pass, low-pass, band-pass, notch, and peaking filters, with voltage controlled frequency and Q. Envisaged in 1970 by Tonus Inc, recreated in 2024 by AMSynths. It is the most versatile filter produced. Background The AM1031 is a re-imagining of a “lost” ARP 2500 module, with only a brief description […]
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The AM8176 module has three vactrol filters which can be independently adjusted for frequency, resonance and modulation depth. The modulation inputs are usually driven by one or more LFO’s to create band pass sweeps. Description Rotary potentiometers (with TR808 style knobs) at the top of the front panel are used to adjust the level of […]
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This 12HP Eurorack module is a replica of the Roland Jupiter 6 voltage controlled filter, which has two 2-pole State Variable filters in series which provide 24dB low and high pass modes, as well as a 12dB band pass filter. Overview The analog polysynth Jupiter 6 was launched in 1983 with six voices that used […]
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One of the key components in vintage Roland synthesizers is the IR3109 four stage OTA chip. It enabled polyphonic analog synthesizers to be created due its smaller footprint and it helped create the sound of the 1980’s Roland analog synth, until digital filters took over in 1987. This post explores the technology inside the chip […]
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This 10HP module is faithful replica of the filter from the legendary Roland SH-2 that was released in 1979 and proved very popular with over 7300 sold. The AM8102 is a fantastic sounding 4-pole low pass filter with that unmistakable Roland filter sound, in a narrow skiff friendly Eurorack module. Description The original SH-2 uses […]
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This 10HP module is a replica of the low pass VCF from the legendary Roland SH-101 which was launched in November 1982 and became one of Roland’s most popular analog synths with 8,000 sold over 5 years. In 2022 Alfa Rpar released the AS3109 in SMD, a clone of the IR3109 filter chip which is […]
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Introduction Inspired by Hainbachs use of test equipment I bought a 1621 Band Pass Filter in May 2021, to add a different sound into my analog synthesizers, especially the Big Moog. The 1621 was in good condition and was made in the 1980’s. It is a tunable single pole Butterworth filter with switchable bandwidths, with […]
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