Signal Chain

From WiKPA
Jump to: navigation, search

This page describes the Kemper's digital signal chain, which follows the visual layout of the front panel below. The signal is routed from left to right:

INPUT STOMPS STACK EFFECTS OUTPUT
INPUT A B C D AMP EQ CAB X MOD DELAY REVERB OUTPUT

The Amp Section is Mono, so any stereo effects in the Stomp Section will be mixed down to mono.

All effects are processed in serial, with the exception of Delay/Reverb, which use a special parameter in the Reverb to determine whether they operate in parallel, serial, or a hybrid. Additionally, the Output block gives the ability to turn off Delay/Reverb and apply different EQ'ing for specific outputs.

Kpa-signal-chain.jpg

Input

The Input section of the Kemper Profiler.

Noise Gate

See Noise Gate. Note, this is not actually a gate, but a noise suppressor.

Be aware that the front panel Noise Gate is part of the Input Stage. Consequently it's included in Input locking as well as Input presets.

Options

  • LOCK / UNLOCK

Parameters

Since firmware 2.2.0 as follows:

  • Clean Sense (-12 dB to +12 dB - default: 0.0)
  • Distortion Sense (-12 dB to +12 dB - default: 0.0)
  • Input Source (Front Input, Alternative Input, Return Input Reamp, SPDIF Input Reamp - default: Front Input)
  • Reamp Sense (-12 dB to +12 dB - default: 0.0 - only available if Input Source set to Return Input Reamp or SPDIF Input Reamp)

For more information on how to use Clean Sense and Distortion Sense, please check this page.


Stomp Section

The Stomp Section of the Kemper Profiler consists of the 4 effects slots that are processed before the signal reaches the Stack section. These slots can be assigned any effect other than Delay and Reverb. See Effects.

Every slot can be unassigned (i.e. made empty). Just press and hold the button of the slot you want to free up to access the menu, and then turn the Type knob counter-clockwise 'till you have no effect selected. Press Store and confirm.

The Stomps Menu allows you to reorder these effects in a nice user interface.

Options

  • Select & Move Effect
  • Switch the whole Stomp Section on / off
  • LOCK / UNLOCK

Parameters

  • Control one "main parameter" of each activated stomp effect

A, B, C & D Slot

  • Switch a slot on / off
  • LOCK / UNLOCK

Further options and parameters depend on the effect chosen in one of the 4 Stomp slots. For more information on stomp effects please visit this page.

Stack Section

The Stack Section of the Kemper Profiler

Options

  • Switch the whole Stack Section on / off
  • Rename the Amp name of the selected rig
  • LOCK / UNLOCK

Parameters

  • n/a

Amplifier Slot

Options

  • Switch the Amplifier Slot on / off
  • Show Tag
  • LOCK / UNLOCK

Parameters

  • Page 1/2
    • Definition (no default, this parameter is set by the profiling process)
    • Power Sagging (default 0)
    • Pick (default 0) - The “Pick” parameter allows you to control the level and sharpness of the pick attack independently from the sustained portion of the sound. The result is also independent from the amount of distortion. You can use this parameter to make clean sounds even more percussive without having to use a compressor. With fully distorted sounds, you can revive the attack phase of any notes that get drowned in the natural compression caused by distortion. If you set “Pick” to a negative value, it will soften the attack, resulting in a more fluid sound. --Kemper Reference Manual
    • Compressor
  • Page 2/2
    • Clarity (default 0)
    • Tube Shape (default 3.3)
    • Tube Bias (default 0)
    • Direct Mix (default 0) - This blends the original (dry) signal in with the rig. So basically, if you play a distorted profile and add some direct mix, you will get a blend of your dry guitar coming in. You can get that Wet\Dry sort of sound (although in mono). The dry signal mixed with the processed one is the signal after the Stomp section. The mix happens before Eq-Cabinet section. when set @ 10, the two signals are mixed 50% and 50%.

EQ Slot

For graphs on how these controls affect freqeuncy response, see this thread.

Options

  • Switch the EQ Slot on / off
  • LOCK / UNLOCK

Parameters

  • Bass - range -5 +5 going more or less from -12 to +4 db @ 80 HZ. It is a shelving filter that start works under 800 HZ, and progressively grow until 0 HZ.
  • Middle - range -5 +5 corresponding from to -7 to +5 db. It is a band pass filter on the center frequency like in the figure below. The center Freq seems around 600-800 HZ, it has a very large bandwidth.
  • Treble - range -5 +5 going more or less from -12 to +4 db @ 10 kHZ. It is a shelving filter that start works above 500 HZ, and progressively grow until 20 kHZ when cutting, but the shelf levels off around 2.5 kHZ when boosting.
  • Presence - range -5 +5 equal to -12 +12 dB. It is a shelving filter that raise or lower from -12 to +12 dB like in the figure below. It start works above 500 Hz, and progressively grows until 20 kHZ.

Cabinet Slot

see the Cabinet Block page.

Options

  • Switch the EQ Slot on / off
  • Show Tag
  • LOCK / UNLOCK

Parameters

  • High Shift
  • Low Shift
  • Character
  • Volume


Effects Section

The Effects Section of the Kemper Profiler consists of the X, Mod, Delay, and Reverb effects slots that are processed after the signal leaves the Stack section. The X and Mod slots can be assigned any effect other than Delay and Reverb, while the Delay are Reverb slots are reserved for those particular effects. See Effects.

Every slot can be unassigned (i.e. made empty). Just press and hold the button of the slot you want to free up to access the menu, and then turn the Type knob counter-clockwise 'till you have no effect selected. Press Store and confirm.

Options

  • LOCK / UNLOCK

Parameters

  • Control one "main parameter" of each activated stomp effect

X Slot

Options and parameters depend on the effect chosen. For more information on stomp effects please visit this page.

MOD Slot

Options and parameters depend on the effect chosen. For more information on stomp effects please visit this page.

Delay Slot

Reverb Slot

Effects Loop

The effects loop can be made to be part of the signal chain by assigning one of the Loop Effects to a Stomps or Effects slot.

Options

  • physically it uses the Direct Out and the Return and Alternative Input jacks
  • but it is only activated if a "Loop" is selected in one slot of the Stomp or Effects Sections.

Parameters


Output / Master

Parameters saved and recall in output presets

OUTPUT PRESETS parameters saved/recalled in presets (FW v3.1.4)

  • page 1/6
    • main output config = recalled
    • monitor output config = recalled
    • direct output config = recalled
    • SPDIF output config = recalled
  • page 2/6
    • main volume dB= ignored
    • monitor volume dB= ignored
    • direct volume dB= ignored
    • headphone volume dB= ignored
    • main out link on/off = recalled
    • monitor out link on/off = recalled
    • direct out link on/off = recalled
    • headphone out link on/off= recalled
  • page 3/6
    • monitor output eq= all values recalled
    • monitor cab on/off = ignored
  • page 4/6
    • main output eq= all values recalled
  • page 5/6
    • SPDIF volume= ignored
    • pure cab amount= recalled
    • headphone space amount =recalled
    • SPDIF outlink = recalled
    • pure cab on/off = recalled
    • headphone space on/off= recalled
  • page 6/6
    • aux in main= recalled
    • aux in headphones = recalled
    • constant latency = ignored

TIP: Output settings stored in FW 3.0.2 did no correctly recall in 3.1.4, notably, the purecab on/off value as it was not available in FW 3.0.2 so what happens is the value does not get alaterd. You need to re-save your output settings in the new FW for the pure-cab values to be recalled.

Options

  • SPDIF Out Link
  • LOCK / UNLOCK

Parameters

  • Page 1/5
    • Main Output
    • Monitor Output
    • Direct Output
    • SPDIF Output
  • Page 2/5
    • Main Volume
    • Monitor Volume
    • Direct Volume
    • Headphone Volume
  • Page 3/5 (Monitor Output EQ) (for frequency response graphs, see this thread)
    • Bass (centre frequency: 150 Hz)
    • Middle (centre frequency: 600 Hz)
    • Treble (centre frequency: 2400 Hz)
    • Presence (centre frequency: 10000 Hz)
  • Page 4/5 (Main Output EQ) (for frequency response graphs, see this thread)
    • Bass (centre frequency: 150 Hz)
    • Middle (centre frequency: 600 Hz)
    • Treble (centre frequency: 2400 Hz)
    • Presence (centre frequency: 10000 Hz)
  • Page 5/5
    • Aux In Volume
    • SPDIF Volume
    • n/a
    • Space

Master Volume

  • Direct Volume (-infinit dB to 0.0dB - default: ??)