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Well I've had the Andromeda for about 2 months now. So I think I have a pretty good handle on what the Andromeda offers. Firsly a little background.
Before I took delivery of the Andromeda, I only had a brief play with on at a seminar. I remeber the synth sounding rather harsh, but the single sound I programmed on it was promising. I liked the specs and what was offer and in blind leap of faith, I sold my Minimoog, Juno106, mks80 and Ax-73 analogs to fund my purchase of the unit.
After bringing it home and playing it - I wasn't quite sure what to make of the sound. I guess I was slighlty disappointed, it just sounded so clean and hardly vintage like. The next day I started programming some sounds, turning off the backgroundtuning to let the sound drift like the good old boys. Then I started to like and began to see the depths of the synth. So began the "honeymoon" period :)
After a few weeks I began to hate it, I guess the Honeymoon was over. At this point most people would sell it. I stuck with it, and now I love it! I think the attitude and the purpose of what you think the Andromeda is all about will greatly effect your judgement of the synth. I guess I intitally expected the Andromeda to be all and end of analogs. It can't, but it comes darn close!
The basic architecture - is a 2VCO+2sub-oscillator and 2 filters per voice. Add 3 LFOs, 3 envelopes, a Sample and hold, portamento (which can act as a 4th simple envelope for the VCO and/or Filters) and a modulation structure.
The VCOs are nicely featured and can be independantly modulated! A big plus for me. They feature Saw (positive or negative) Square (with pulsewidth control and modulation), Triangle and SIne. All waveforms can be selected, and the Square waveform has variable volume. Each VCO also has a sub-oscillator, which can be used to add that octave below or to create new waveforms. The Andromeda's oscillator mixer (pre-filter mixer) uses a ratio system for the sub-oscllilator, so it can be set to create a waveform, which will not be disturbed by the actually VCO level. Mixing the sub-oscillator at level 34.7 with a Sawtooth creates a nicely rounded sawtooth type waveform, great for thick sounds. You also have the usual, linear and expononetial FM, hard and soft-sync, 3 shapes of noise, VCO to filter FM, noise to VCO fm etc.
The 2 filters also have different character - the multimode 12db filter based on the Oberheim SEM filter, is a bit more aggressive, and will overdrive at high resonance settings, but will not self-oscillate. You can always back down the oscillator volumes to reduce the saturation. This filter offers Low pass, High pass, Band pass and Band reject. The 24db filter is based on the Moog Modular low pass filter, and subjectively is the weaker of the 2 filters on hand. The volume drops as resonance increase , as does the bass, just like the Moog Modular's. But it does sound much warmer and the resonance is very soft and organic, unlike the strong resonance in the Roland analog synths. This filter will self-oscillate.
Both filters can be used at the same time, with outputs from all filters up at the mixer - 12db LPF, BPF, HPF and the 24db LPF. Or they can be run in several serial configuarions. This allows for some nice vocal and formant type sounds. there is also a filter feedback button which re-routs the audio back into the Pre-filter mixer. This changes the sound depending on the filter configurations. Sometimes you get a thicker sound, sometimes overdrive. Other times it will spike the resonance of the filters . This is actually how one can emulate the sound of Roland filters, and it will also send the 12db Multimode filter into self-oscillation.
The envelopes and LFOs are very flexible! The envelopes have 2 decays and 2 releases, plus each stage can have a different slope. You can emulate a lot of the character from various vintage analog synths by fiddling around here. They can also be looped, and bounty of triggering options, such as triggering by LFOs. LFOs are nicely slow - 0.07 hertz or so, but not too fast on the fast end 25hertz. You can substitue a looping enevlope for faster modulation :) Unlike LFOs in other synths, you have 10 times the flexibility on offer here! LFOs can be, be delayed, offset, uni-polar or bi-polar, their levels determined, their phase changed, modulated plus a slew of triggering and syncing options
Tonally - the A6 has a smooth, chorusy sound, soft and watery like. It can also get mighty harsh if you so wish. The 2 mixers on the A6 , the Pre-filter mixer and the Post-filter mixer greatly effect the sound and tone of the Andromeda. 90% of the presets overload these 2 mixers for that gritty sound many have commented on. These mixers are analog and will clip. The levels of these mixers will also determine how hard you drive the filters.
Soundwise it can definitely get those Moog sounds down. Moog modular and especially the Mini. A few others say it can do MemoryMoog nicely, I have never heard one so I can't vouch for that. It can also do some Oberheim and some other American synths if you are familiar with those synths in question and know the A6 inside out. It can do some Japanese synth sounds, but the responce of the filters are nothing like the 24db Roland filters which have a more agressive sounding resonance.
Personally I find the sounds the Andromeda can make to be quite powerful. OK discrete analogs will sound better, but given the tools and sound capabilities on offer that is acceptable trade off. I've also found a tonal difference betwen the main outs and the Aux/voice outs. The main outs sound muddy and a bit soft vs the Aux and voice outs - I would use the Aux and voice outs for bass and drums, because of the better high frequency and attack characteristics
The Andromeda features a lot for the money. With the help of the extensive but somehwat fiddly modulation capabilities, the A6 can enter the world of modular analogs as far as the types of sounds one would normally hear from them, but in the Andromeda's case you can play them polyphonicly. Unlike the modulars however the modulation speed is a tad slower. That is the drawbacks of software generation, but the hardwired modulations such as the filter envelopes are nice and responsive.
Because of the flexible architecture, the Andromeda can certainly do sounds that many analog synths would be hard pressed to do likewise, such as complex analog drums, Wavestation style pads and vocal/formant/choir sounds. And even analog pianos! Add modern midi specs where every knobs will send and receive controller data (in the latest OS). Add a fully assignable ribbon controller, nice keyboard, 3 filter inputs (which also function as audio triggers that can be routed as a modulation source), CV inputs, 16 16x3 step sequencers and arpeggiator, and you have one of the deepest and most complete analog polyphonics that can give many an analog mono-synth a big fright!
I have plenty of new mp3s here with many more new ones coming every so often
http://members.optushome.com.au/coolcolj/SoundBites/
On a final note I have discovered many cool things about the A6's architecture, please check the A6 mailing list archives if you wish to learn more. http://www.code404.com/a6/
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