The One Control Minimal Series MIDI Input Selector is a compact A/B input switcher that lets you switch between two instruments or signal sources, such as two guitars or a guitar and a stereo synthesizer, either from its own footswitch or from a MIDI controller1. It sits in the MIDI pedals family of One Control's Minimal Series, the maker's line of small-format switching and utility boxes.
Because it is a passive true-bypass design, the unit does not color the signal it passes, and One Control notes that the same design lets it work as a stereo A/B box when connected in reverse1. It is listed at $109.99 USD, shown against a crossed-out regular price of $137.99 USD, and was marked sold out on the maker's product page as of 26 October 20261.
One Control's product page listed the MIDI Input Selector as sold out as of 26 October 2026, so it may need to be sourced secondhand while the maker's stock is out.
What it does
The core job is simple: two sources go in, one comes out, and you choose which source is live. One Control describes the unit as letting you "seamlessly switch between two instruments such as guitars, stereo synthes"1, and the switching can be done two ways:
- Footswitch: pressing it switches between the two input sources1
- MIDI: the unit responds to MIDI Program Change (PC) and Control Change (CC) messages, so a MIDI controller or switcher on your board can change the active input as part of a preset1
That MIDI control is what separates it from a plain A/B box. If you already run a MIDI-controlled rig, for example with a loop switcher such as the One Control Minimal Series MIDI Dual Stereo Loop or the MIDI Solo Stereo Loop, the Input Selector can change instruments on command without you touching it, in time with the rest of your preset changes23.
Inputs, outputs and controls
The unit keeps the Minimal Series habit of doing a lot with few controls. The connections and controls are:
| Control or jack | What it does |
|---|---|
| Input A | Connect an instrument or signal source |
| Input B | Connect a second instrument or signal source |
| Output | Connect to your amplifier, audio interface, or other gear; can be reversed for A/B box use |
| Footswitch | Switches between input sources |
| DIP switch | Selects the MIDI channel the unit responds to |
| MIDI in | Receives PC and CC messages from a MIDI controller |
All of the above comes from One Control's product page1. The unit runs in stereo or mono with full stereo input and output1, so a player switching between a stereo synthesizer and a mono guitar, or two stereo sources, is covered by one box.
The footswitch also has two operation modes, Standard and Flash1. One Control's product page names both modes but does not describe how they differ; the included manual covers the unit's operation in detail1.
True bypass and A/B box use
One Control describes the switching as passive true bypass, and states that "because of its passive true-bypass design, it can also function as a stereo A/B box when connected in reverse"1. In practice that means the same box can be turned around: one instrument goes into what was the output, and the two former inputs become outputs to, say, two amplifiers, with the footswitch or MIDI choosing which amp receives the signal.
Used this way it overlaps with the One Control Minimal Series AB Box, which has one input and two outputs usable in both directions and works as an amp selector, input selector, or tuner output/mute switch4. The difference is control: the AB Box is footswitch only, while the MIDI Input Selector adds PC and CC switching.
Power and current draw
The unit draws 60 mA1. For comparison within the same series, the MIDI Solo Stereo Loop draws up to 100 mA and the MIDI Dual Stereo Loop draws 120 mA32, so the Input Selector is the lightest of the three MIDI-capable Minimal Series boxes on current. One Control does not state a supply voltage for the Input Selector on its product page; the series' other MIDI units run on 9V DC center-negative supplies32.
Compared with other Minimal Series switchers
The Input Selector is one of several small switching boxes in One Control's Minimal Series, and the choice between them comes down to what you need switched and how:
- MIDI Solo Stereo Loop: a MIDI-controlled stereo loop pedal, built to be the smallest stereo 1-loop switcher controlled by MIDI, with a MIDI channel encoder assignable to channels 1 through 4 and control by PC or CC3
- MIDI Dual Stereo Loop: a MIDI-controlled dual stereo effects loop switcher, using 1 to 8 MIDI channels, with TRS stereo jacks throughout and the ability to convert mono signals to dual mono for stereo effects2
- Minimal Series 1 Loop Box: a non-MIDI true bypass loop box that can also serve as an input selector using only its INPUT, RETURN, and OUTPUT jacks5
- Minimal Series AB Box: a passive one-in, two-out box for amp selection, input selection, or tuner output and muting4
The Input Selector is the one to pick from this group when the job is specifically choosing between two input sources and you want MIDI to be able to do the choosing1.
Questions
Is the One Control Minimal Series MIDI Input Selector true bypass?
Yes. One Control describes it as a passive true-bypass design, so the selected input passes through without active buffering or conversion. The same passive design is what lets it also function as a stereo A/B box when the connections are reversed.
Does the MIDI Input Selector work in stereo?
Yes. One Control states the unit is stereo or mono compatible, with full stereo input and output. You can run two stereo sources into Inputs A and B and switch between them without dropping to mono.
How do I set the MIDI channel on the MIDI Input Selector?
The MIDI channel is selected with a DIP switch on the unit. Set the switch position to match the channel your MIDI controller is transmitting on, and the selector will respond to Program Change and Control Change messages on that channel.
What is the difference between Standard and Flash mode?
The footswitch has two operation modes, Standard and Flash. One Control lists both modes among the unit's features, but the product page does not describe how their behavior differs, so check the included manual for the details of each mode.
How much current does the MIDI Input Selector draw?
One Control lists the current consumption as 60 mA. That is modest by MIDI-switcher standards, and it leaves room on a typical isolated power supply for several other pedals on the same board.
Can the MIDI Input Selector be used as an AB box?
Yes. Because of its passive true-bypass design, One Control states it can function as a stereo A/B box when connected in reverse, sending one input to a choice of two outputs, for example to select between two amplifiers.
Sources (5)
- Minimal Series MIDI Input Selector (OC-M-MIS), One Control USA
- Minimal Series MIDI Dual Stereo Loop (OC-M-MDSL), One Control USA
- Minimal Series MIDI Solo Stereo Loop Inspired by Josh Smith (OC-M-SSL-, One Control USA
- Minimal Series ABBOX(OC-M-AB), One Control USA
- Minimal Series 1 Loop Box (OC-M-1L), One Control USA
