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The Fulltone True-Path ABY-ST Box is the quietest channel switcher never heard. Featuring soft switches, transparent signal, switchable buffer per channel, & lift/ground & phase switches.
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The CS-ABY-ST is now the "v2," is now Black, still the best ABY switcher in the world, and just got a LOT smaller! The CS-ABY-ST V2 has silent soft switches. No pops, no ticks, and no electrocutions, thanks to a Nickel core custom-wound 1:1 transformer that doesn't boost the treble frequencies like the "industry standard" transformer does, so fuzzes played through the True-Path sound round and distortions don't sound strident.
Fulltone CS ABY-STv2 Soft Touch True-Path Switcher Features:
Using the most advanced 4 opto switching system ever, yet also offering the purest signal. Fulltone developed our photocells over the last year with a rather patient optocoupler manufacturer (Thanks Fred), and their cells only have around only 50 ohms series resistance compared to the Vactecs (which all other optocoupler switchers use) offering a whopping 300-400 ohms of series resistance to your guitar's signal.
The True-Path ABY switcher to solve all of the issues that arise from combining amplifiers, and to sound absolutely transparent in the process. All other ABY’s “thump” when switching, yes, even the $300+ ones that claim they don’t. Fulltone developed a circuit that rapidly pans between the outputs, completely eliminating “thumps.”
On this subject: Especially when using single coil pickups, lights and stray electro-magnetic-fields (EMF’s) can appear to be a slight “ticking” noise, but this is simply those noises coming through your pickups and cutting on and off as the signal pans between the outputs. To test this, simply turn off your Guitar’s volume knob and hear that our ABY is dead-quiet. “ST” stands for “Soft Touch,” meaning it has smooth-actuating, non-latching, momentary footswitches that are absolutely quiet for studio and/or live applications, where even the click of a footswitch could get you noticed in the wrong way.
The ABY-ST v2 is simply 25% smaller than v1, with no changes to the circuitry because quite frankly it is perfect.
Want it Buffered? You got it.
Each channel has switchable JFET Buffers to drive long lengths of cables without any tone loss. Want it clean & clear for Fuzztones? Let me explain: Fuzz pedals like to be hit with High impedance signal like your pickups produce. Buffers are Low Impedance, so if you are a Fuzz connoisseur like me you simply turn off the buffer on the ABY channel that goes to your Fuzzes.
Want to correct the phase between your 2 amps? You got it.
I know the other ABY's says they're silent... but truth is they have a slight "thump" that becomes a loud "BOOM" when splitting say a Twin Reverb and Vintage Plexi Marshall.
Do not confuse this with a simple metal box and 2 switches that comprise 99% of the ABY's out there. Those sound ok UNTIL your signal chain reaches 20 feet or more... UNTIL you hit "Both" and the signal is loaded down to oblivion, or UNTIL you get electrocuted because of grounding issues due to the absence of an Isolation Transformer that the True-Path has!
And don't think that your tone is going to suck because you see the inside of the True-Path and think that your signal is going through a bunch of circuitry. No Audio signal passes through the switches or ANY of that circuity! Your signal is going through ONE RESISTOR in the True-Path (that's the optocoupler), or if you choose, it will go through a tone-full JFET unity gain buffer that is rich and sweet, and perhaps a custom wound Nickel-core Audio transformer (B channel only).
All that gadgetry in the True-Path is simply to light up those 4 optocoupler in a way that they don't POP when switching between amps...NONE of your guitar signal goes through that.
It's pure, it's True-Path, it's Fulltone.
Controls:
Input: Connect a cable (shielded with ¼” mono plugs) coming from your guitar, bass, or other instrument into this jack. Always use good quality shielded cables (eg. Fulltone Gold Standards) for audio signals, speaker cables are un-shielded and should not ever be used to connect your instrument.
A-Out: (#12) Connect a cable (shielded with ¼” mono plugs) going to your amplifier. A-Out does not have a transformer on it. It does have a switchable Buffer.
B-Out: (#11) Connect a cable (shielded with ¼” mono plugs) going to your amplifier. B-Out has a 1:1 transformer that is always in the signal path. This transformer is Fulltone custom-wound designed to reduce shock hazard when running multiple amps. B-Out also has a switchable Buffer. True-Path ABY’s do not have a “Tuner-Out” on its ABY’s because quite simply they introduce a clicking sound (from the Tuner) to the audio path that we find unacceptable.
A or B footswitch: (see #1) Press this to send the signal to either A-Out or B-Out. When the Yellow L.E.D (#3) is lit, signal only flows to A-Out. When the Green L.E.D (#4) is lit, signal only flows to B-Out.
Both footswitch: (#2) Press this to have both the signal flow to A-Out and B-Out simultaneously. Can be done whether you are on channel A or channel B.
Channel-A Buffer switch: (#5) Turns ON or OFF a high-quality JFET Buffer circuit affecting only the A-Out. A buffer is helpful because it can drive the longer cable lengths which you have if you’re using a pedalboard with multiple pedals, multiple pedal connecting cables, and instrument cables with a combined total of 25 or more feet. Without a buffer you will experience Treble loss as well as overall signal level loss, meaning that your amp won’t respond to your touch like it would plugging the guitar straight in with just a 10 foot cable. The downside to a buffer is that certain Fuzz pedals do not react well to the buffer’s low-impedance signal. That’s why the buffer feature is defeatable on the True-Path ABY.
Channel-B Buffer switch: (#6) Turns ON or OFF a second high-quality JFET Buffer circuit affecting only the B-Out. This buffer is also defeatable.
Ground-Lift for B-Out: (#7) The default setting for this switch is “Grounded.” It offers the ability to “lift” the ground on the B-Out although they cannot recommend lifting grounds for safety and legal reasons. When this switch is set to “lifted,” there can sometimes be less hum in the amp connected to the B-Out.
Phase switch for B-Out: (#8) This switch corrects phase issues between 2 amps. Phase is the relationship between 2 different sound waves, and amps can often be “out of phase” with each other resulting in weak sound when combining the amps using the Both footswitch. To check phase, position the 2 amps directly in front of you (about 6 or more feet apart) both equal distance from the wall. Turning the amps on, select the Both switch and start moving the Phase switch.
