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March 2024: all pages have been checked and are up-to-date

IR Player block

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Revision as of 08:37, 18 September 2021 by Yek (talk | contribs) (→‎FullRes IRs)
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IR.png

Available on which products

  • Axe-Fx III: 1 block (previous to firmware 17: 2 blocks)
  • FM3: no
  • FM9: no
  • Axe-Fx II: no
  • AX8: no
  • FX8: no

Channels or X/Y switching

  • Axe-Fx III: 4 channels

What is the IR Player

The IR Player block is a simplified Cab block.

It processes a single IR, has less features than the Cab block and therefore requires less CPU. It can also process Tone Match block data which has been exported as an IR. This makes it the first choice to run an impulse response of a device such an acoustic guitar or a preamp.

Read this:

Phase correction

"The Cab and IR Player blocks automatically "phase correct" IRs so that the peak signal is positive." [1]

"When an IR is read from storage the first few hundred samples are scanned and the maxima is found. If the maxima is a negative value the polarity of the IR is inverted because it is assumed the polarity of the IR was inverted when captured. This can happen if the speaker is wired backwards, the IR is captured from the back of the cabinet, the back of a ribbon mic is used, or a polarity inversion occurs in the power amp or mic preamp." [2]

FullRes IRs

Firmware 17 for the Axe-Fx combines the previous two IR Player instances into a single, stereo IR Player block with individual level and pan and a mix control. The IR Player supports FullRes IRs. [3]

Firmware 17 release notes:

"The IR Player block and the Cabinet block both support FullRes IRs. The last two slots of the Cabinet block support FullRes. This is sufficient to provide two room mics, a left and a right, along with two direct mics within a single Cabinet block. The two IR Player blocks have been combined into a single, stereo IR Player block with individual level and pan controls for each IR. Setting the IR Length to OFF defeats the IR. A Mix control is also provided so the block can be used as a convolution reverb. A Mode control allows the two IRs to be in parallel or series. When in series the individual level and pan controls are defeated and removed from the UI."

Parameters

Parameters table

Parameter Axe-Fx III
Bank yes
Number yes
Low Cut, High Cut yes
Filter Slope yes
Length yes
Input Select yes

Mode

The MODE parameter selects between Normal Res and Hi-/UltraRes IRs.