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Features of the Focusrite Scarlett Gen 2/3 devices which are supported by the Linux ALSA mixer driver
6i6 Gen 2
---------
- 6x Hardware Inputs
- Analogue In 1-2: Mic/Line/Inst In 1-2 (Pad)
- Analogue In 3-4: Line In 3-4
- S/PDIF 1-2
- Hardware Input Controls
- 2x Input Gain knobs for Analogue In 1-2
- Fixed Input Gain for Analogue In 3-4
- Phantom Power for Analogue 1-2 linked
- 6x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L) + Headphone 1 Left
- Analogue 2: Line 2 Out (Monitor R) + Headphone 1 Right
- Analogue 3: Line 3 Out + Headphone 2 Left
- Analogue 4: Line 4 Out + Headphone 2 Right
- S/PDIF 1-2
- Hardware Output Controls
- Monitor volume knob controlling Line 1+2
- No physical control for Line 3+4 output volume
- Headphone 1 volume knob controlling Headphone 1 Volume
- Headphone 2 volume knob controlling Headphone 2 Volume
- 4x Mute + Line Out Gain controls -127dB to 0dB
- 1-2 control Line 1-2 Out and Headphone 1
- 3-4 control Line 3-4 Out and Headphone 2
- Mixer: 18 input (1-18), 10 output (A-J)
- 18x10 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 6x PCM Inputs (USB device to host)
- 6x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-4, S/PDIF 1-2, Mix A-J, PCM Outputs 1-6
- Sync Status
- Clock Source: Internal or S/PDIF
18i8 Gen 2
----------
- 18x Hardware Inputs
- Analogue 1-2: Mic/Line/Inst In 1-2 (Pad)
- Analogue 3-4: Mic/Line In 3-4 (Pad)
- Analogue 5-8: Line In 5-8
- S/PDIF 1-2
- ADAT 1-8
- Hardware Input Controls
- 4x Input Gain knobs for Analogue In 1-4
- Fixed Input Gain for Analogue In 5-8
- Phantom Power for Analogue 1-2 linked
- Phantom Power for Analogue 3-4 linked
- 8x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L)
- Analogue 2: Line 2 Out (Monitor R)
- Analogue 3: Headphone 1 Left
- Analogue 4: Headphone 1 Right
- Analogue 5: Headphone 2 Left
- Analogue 6: Headphone 2 Right
- S/PDIF 1-2
- Hardware Output Controls
- Monitor volume knob controlling Line 1+2
- Headphone 1 volume knob controlling Headphone 1 Volume
- Headphone 2 volume knob controlling Headphone 2 Volume
- 6x Mute + Line Out Gain controls -127dB to 0dB
- 1-2 control Line 1-2 Out
- 3-4 control Headphone 1
- 5-6 control Headphone 2
- Mixer: 20 input (1-20), 10 output (A-J)
- 20x10 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 20x PCM Inputs (USB device to host)
- 8x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-8, S/PDIF 1-2, ADAT 1-8, Mix A-J, PCM
Outputs 1-8
- Sync Status
- Clock Source: Internal, S/PDIF, or ADAT
18i20 Gen 2
----------
- 18x Hardware Inputs
- Analogue 1-2: Mic/Line/Inst In 1-2 (Pad)
- Analogue 3-8: Mic/Line In 3-8
- S/PDIF 1-2
- ADAT 1-8
- Hardware Input Controls
- 8x Input Gain knobs for Analogue In 1-8
- Phantom Power for Analogue 1-4 linked
- Phantom Power for Analogue 5-8 linked
- 20x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L)
- Analogue 2: Line 2 Out (Monitor R)
- Analogue 3: Line 3 Out
- Analogue 4: Line 4 Out
- Analogue 5: Line 5 Out
- Analogue 6: Line 6 Out
- Analogue 7: Line 7 Out + Headphone 1 Left
- Analogue 8: Line 8 Out + Headphone 1 Right
- Analogue 9: Line 9 Out + Headphone 2 Left
- Analogue 10: Line 10 Out + Headphone 2 Right
- S/PDIF 1-2
- ADAT 1-8
- Hardware Output Controls
- For Analogue 1-8 Outputs:
- 8x SW/HW Volume Control Switch
- 8x SW Line Out Gain controls -127dB to 0dB
- 8x SW Mute
- Monitor volume knob controlling volume of Analogue 1-8 (selected
by SW/HW Volume Control Switches)
- Global Mute and Dim controlling Analogue 1-8 (enabled per-channel
if SW/HW Volume Control Switch set to HW)
- 2x Headphone volume knob controlling Headphone volume (applied in
addition to the SW/HW Volume Control)
- Mixer: 20 input (1-20), 10 output (A-J)
- 20x10 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 20x PCM Inputs (USB device to host)
- 18x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-8, S/PDIF 1-2, ADAT 1-8, Mix A-J, PCM
Outputs 1-8
- Sync Status
- Clock Source: Internal, S/PDIF, or ADAT
Solo Gen 3
----------
- 2x Hardware Inputs
- Analogue In 1: Mic In (Air, Phantom Power)
- Analogue In 2: Line/Inst In
- Hardware Input Controls
- 2x Input Gain knobs for Analogue 1-2
- Phantom Power Persistance
- 2x Hardware Outputs
- Analogue Out 1: Line Out Left + Headphone Left
- Analogue Out 2: Line Out Right + Headphone Right
- Hardware Output Controls
- Monitor volume knob controls all outputs together
- 2x PCM Inputs (USB device to host)
- Fixed to Analogue Inputs 1-2
- 2x PCM Outputs (USB host to device)
- Fixed to Analogue Outputs 1-2
- Direct Monitor:
- On: mixes Analogue 1+2 Inputs into both Analogue 1+2 Outputs
2i2 Gen 3
---------
- 2x Hardware Inputs
- Analogue In 1-2: Mic/Line/Inst In 1-2 (Air)
- Hardware Input Controls
- 2x Input Gain knobs for Analogue 1-2
- Phantom Power for Analogue 1-2 linked
- Phantom Power Persistance
- 2x Hardware Outputs
- Analogue Out 1: Line Out Left + Headphone Left
- Analogue Out 2: Line Out Right + Headphone Right
- Hardware Output Controls
- Monitor volume knob for Line Out Left and Right
- Headphone volume knob for Headphone
- 2x PCM Inputs (USB device to host)
- Fixed to Analogue Inputs 1-2
- 2x PCM Outputs (USB host to device)
- Fixed to Analogue Outputs 1-2
- Direct Monitor:
- Mono: mixes both Analogue 1+2 Inputs into both Analogue 1+2
Outputs
- Stereo: mixes Analogue 1+2 Inputs into Analogue 1+2 Outputs
respectively
4i4 Gen 3
---------
- 4x Hardware Inputs
- Analogue In 1-2: Mic/Line/Inst In 1-2 (Air, Pad)
- Analogue In 3-4: Line In 3-4
- Hardware Input Controls
- 2x Input Gain knobs for Analogue In 1-2
- Fixed Input Gain for Analogue In 3-4
- Phantom Power for Analogue 1-2 linked
- Phantom Power Persistance
- 4x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L)
- Analogue 2: Line 2 Out (Monitor R)
- Analogue 3: Line 3 Out + Headphone Left
- Analogue 4: Line 4 Out + Headphone Right
- Hardware Output Controls
- Monitor volume knob controlling Line 1+2
- Headphone volume knob controlling Headphone volume
- No physical control for Line 3+4 output volume
- 4x Mute + Line Out Gain controls -127dB to 0dB
- 1-2 control Line 1-2 Out
- 3-4 control Line 3-4 Out and Headphone
- Mixer: 8 input (1-8), 6 output (A-F)
- 8x6 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 6x PCM Inputs (USB device to host)
- 4x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-4, Mix A-F, PCM Outputs 1-4
- Sync Status
8i6 Gen 3
---------
- 8x Hardware Inputs
- Analogue 1-2: Mic/Line/Inst In 1-2 (Air, Pad)
- Analogue 3-6: Line In 3-6
- S/PDIF 1-2
- Hardware Input Controls
- 2x Input Gain knobs for Analogue In 1-2
- Fixed Input Gain for Analogue In 3-6
- Phantom Power for Analogue 1-2 linked
- Phantom Power Persistance
- 6x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L) + Headphone 1 Left
- Analogue 2: Line 2 Out (Monitor R) + Headphone 1 Right
- Analogue 3: Line 3 Out + Headphone 2 Left
- Analogue 4: Line 4 Out + Headphone 2 Right
- S/PDIF 1-2
- Hardware Output Controls
- Monitor volume knob controlling Line 1+2
- No physical control for Line 3+4 output volume
- Headphone 1 volume knob controlling Headphone 1 Volume
- Headphone 2 volume knob controlling Headphone 2 Volume
- 4x Line Out Gain controls -127dB to 0dB
- 1-2 control Line 1-2 Out and Headphone 1
- 3-4 control Line 3-4 Out and Headphone 2
- Mixer: 8 input (1-8), 8 output (A-H)
- 8x8 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 10x PCM Inputs (USB device to host)
- 6x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-6, S/PDIF 1-2, Mix A-H, PCM Outputs 1-6
- Sync Status
- Clock Source: Internal or S/PDIF
18i8 Gen 3
----------
- 18x Hardware Inputs
- Analogue 1-2: Mic/Line/Inst In 1-2 (Air, Pad)
- Analogue 3-4: Mic/Line In 3-4 (Air, Pad)
- Analogue 5-8: Line In 5-8
- S/PDIF 1-2
- ADAT 1-8
- Hardware Input Controls
- 4x Input Gain knobs for Analogue In 1-4
- Fixed Input Gain for Analogue In 5-8
- Phantom Power for Analogue 1-2 linked
- Phantom Power for Analogue 3-4 linked
- Phantom Power Persistance
- 10x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L)
- Analogue 2: Line 2 Out (Monitor R)
- Analogue 3: Line 3 Out (Alt Monitor L)
- Analogue 4: Line 4 Out (Alt Monitor R)
- Analogue 5: Headphone 1 Left
- Analogue 6: Headphone 1 Right
- Analogue 7: Headphone 2 Left
- Analogue 8: Headphone 2 Right
- S/PDIF 1-2
Note: The Headphones outputs are internally Analogue 3-6 and the rear
Line 3/4 outputs (Alt Monitor) are internally Analogue 7/8, but the
driver hides this from you.
- Hardware Output Controls
- For Analogue 1-8 Outputs:
- 8x SW/HW Volume Control Switch
- 8x SW Line Out Gain controls -127dB to 0dB
- 8x SW Mute
- Monitor volume knob controlling volume of Analogue 1-8 (selected
by SW/HW Volume Control Switches)
- Global mute and dim controlling Analogue 1-8 (enabled per-channel
if SW/HW Volume Control Switch set to HW)
- 2x Headphone volume knob controlling Headphone volume (applied in
addition to the SW/HW Volume Control)
- Mixer: 18 input (1-18), 10 output (A-J)
- 18x10 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 18x PCM Inputs (USB device to host)
- 20x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-8, S/PDIF 1-2, ADAT 1-8, Mix A-J, PCM
Outputs 1-20
- Speaker Switching
- Sync Status
- Clock Source: Internal, S/PDIF, or ADAT
18i20 Gen 3
----------
- 19x Hardware Inputs
- Analogue 1-2: Mic/Line/Inst In 1-2 (Air, Pad)
- Analogue 3-8: Mic/Line In 3-4 (Air, Pad)
- Analogue 9: Talkback Mic
- S/PDIF 1-2
- ADAT 1-8
- Hardware Input Controls
- 8x Input Gain knobs for Analogue In 1-8
- Phantom Power for Analogue 1-4 linked
- Phantom Power for Analogue 5-8 linked
- Phantom Power Persistance
- 20x Hardware Outputs
- Analogue 1: Line 1 Out (Monitor L)
- Analogue 2: Line 2 Out (Monitor R)
- Analogue 3: Line 3 Out
- Analogue 4: Line 4 Out
- Analogue 5: Line 5 Out
- Analogue 6: Line 6 Out
- Analogue 7: Line 7 Out + Headphone 1 Left
- Analogue 8: Line 8 Out + Headphone 1 Right
- Analogue 9: Line 9 Out + Headphone 2 Left
- Analogue 10: Line 10 Out + Headphone 2 Right
- S/PDIF 1-2
- ADAT 1-8
- Hardware Output Controls
- For Analogue 1-8 Outputs:
- 8x SW/HW Volume Control Switch
- 8x SW Line Out Gain controls -127dB to 0dB
- 8x SW Mute
- Monitor volume knob controlling volume of Analogue 1-8 (selected
by SW/HW Volume Control Switches)
- Global Mute and Dim controlling Analogue 1-8 (enabled per-channel
if SW/HW Volume Control Switch set to HW)
- 2x Headphone volume knob controlling Headphone volume (applied in
addition to the SW/HW Volume Control)
- Mixer: 25 input (1-25), 12 output (A-L)
- 25x12 gain controls -80dB to +6dB
- Each input assignable to any of the assignable outputs
- 20x PCM Inputs (USB device to host)
- 20x PCM Outputs (USB host to device)
- Assignable outputs to the hardware outputs, mixer, and PCM Inputs:
- Off, Analogue Inputs 1-8, S/PDIF 1-2, ADAT 1-8, Mix A-J, PCM
Outputs 1-8
- Speaker Switching
- Talkback Mic
- Sync Status
- Clock Source: Internal, S/PDIF, or ADAT
SW/HW switches (18i20 Gen 2, 18i8 Gen 3, and 18i20 Gen 3)
---------------------------------------------------------
SW/HW switches:
- When set to HW, the mute/volume status is controlled by the hardware
volume knob and the global dim/mute controls. The SW volume and mute
buttons will be read-only and track the HW volume and global mute
button.
- When set to SW, the mute/volume status is controlled by the
individual mixer faders and mute control
- The 18i8 has global dim/mute controls in the mixer only
- The 18i20 also has physical global dim/mute controls
Speaker Switching (18i8 Gen 3, and 18i20 Gen 3)
-----------------------------------------------
Speaker Switching:
- When enabled (i.e. Speaker Switching is changed to Main or Alt from Off):
- Line Out 1-4 Volume Control Switches are locked to HW
- Line Out 3/4 routing is saved
- Line Out 3/4 routing is set to the Line Out 1/2 routing
- While set to Main, Line 3/4 muted
- While set to Alt, Line 1/2 muted
- When disabled (i.e. Speaker Switching is changed to Off from Main or Alt):
- Global mute is activated
- Line Out 1-4 Volume Control Switches are unlocked
- Line Out 3/4 routing restored to the saved values
Talkback (18i20 Gen 3)
----------------------
The Talkback feature of the 18i20 Gen 3 has a few parts:
- Talkback Microphone connected to Analogue Input 9
- Talkback Disable/Enable internal switch
- Talkback Off/On physical switch
- Talkback Mix (one switch per mix)
- Mix Input 25
To set up the talkback feature, set Mix Input 25 to the talkback
source (usually Analogue Input 9), enable the Talkback Mix switches
for the mixes you want the talkback input to be heard on, and change
the Talkback control from Disabled to Off. Leave the Mix Input 25 gain
controls at 0 (-127dB), otherwise the talkback inputs will be heard
even when talkback is disabled/off.
Pressing the Talkback switch on the device will then lower the volume
of the other inputs on the mixes for which talkback is enabled and
unmute Mix Input 25 on those mixes.
Talkback can also be activated by changing the Talkback control from
Off to On.
The talkback microphone can also be used just the same as any of the
other analogue inputs and routed to a physical output, PCM input, or
mixer input.
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