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Tone Match block

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File:Amps2.png

Manual

User contributions

Tone Matching

Tone Matching: amp matching

  • Cliff talking about matching the amp models in firmware 6: "The speaker was not part of the equation. The benefit to this technique is that the cabinet is completely separated. "Profiling" lumps the speaker IR with the amplifier output IR since linear functions are not separable. That's why those products don't work well when you try to run into a power amp and conventional guitar cab. You don't really want to use a load box though, if you can help it. A real speaker is a much more realistic load. All you need is a DI box that can handle speaker level signals. You don't even really need a DI box. All you need is a resistive divider to knock the voltage down to line level. I have a simple little box that just has some resistors and a pot to reduce the level which I then send to Input 2." Source
  • Cliff: "There is NO substitute for shooting an IR of the cab. IMO, this is the single most important thing you can do. Everything else is attempting to learn the cab IR through an indirect method and then you have inseparability. If you shoot the IR then do a Tone Match you can change the cab after or do another IR with a different mic or mic position and your matching data is still valid." Source

Tone Matching: how to perform amp matching

  • Here is a brief step-by-step guide to matching an amp, created by Fractal. Source This assumes assumes you have obtained an impulse response of the cabinet being used.
    1. Connect guitar to input of Axe-Fx.
    2. Connect Output 2 Left to input of amplifier being matched.
    3. Connect output of amp to speaker.
    4. Connect mic to preamp. Connect preamp output to Input 2 Left.
    5. In the I/O->AUDIO menu set the following:
      • MAIN INPUT SOURCE: ANALOG IN (1)
      • INPUT 1 LEFT SELECT: LEFT
      • INPUT 1 MODE: LEFT ONLY
      • INPUT 2 MODE: LEFT ONLY
    6. Use Amp Matching Template. This is one of the last presets in Bank C.
    7. Select the IR of the cabinet that you captured in the cabinet block. The preset uses User 1. If your captured IR is not in User 1, then select the appropriate user slot.
    8. Connect a latching or momentary footswitch to the Pedal jack. In the I/O->Pedal menu set the pedal type accordingly. In the I/O->CTRL menu set EXT CTRL 1 to "PEDAL". The pedal now selects between the amp and the Axe-Fx amp block.
    9. Tap the footswitch until the Amp block is bypassed. This sends the signal at Input 2 through the Mixer block and to the main outputs. I have a Reverb block in there because I can't stand totally dry guitar sounds.
    10. Turn the Output 2 Level knob on the front panel all the way up. Play something and adjust the output of the mic preamp to get a good signal level into Input 2 using the Input 2 LEDs as a reference. Adjust the Input 2 trim in the I/O->INPUT menu if necessary. Make sure the mic preamp is not clipping too.
    11. Make note of the general amount of distortion as you are playing. Now tap the footswitch to select the Amp block. Select an amp that is close to the amp being matched. In this example it quickly became evident that the real amp has much more gain so I increased the Input Trim in the Amp block to get more gain. The real amp is a bit darker as well so I decreased the Hi Cut Freq and Triode Plate Freqs a bit as well. Now switch back and forth between the amp and the model and adjust the gain and level until they match. Roll off the guitar volume to verify that the gain is correct. With the volume rolled off you can hear the start of break-up and adjust the gain accordingly. It is not necessary to get an exact match. Just roughly the same.
    12. Tap the footswitch to select the Amp block. Now go to the Tone Matching block and press X and then press Y. Play some chords up and down the neck to get a good frequency density into the analysis engine. Do this for about ten seconds and then press Enter. Congratulations, you now have an amp match.
  • When using a power soak (source):
    1. Instead of running the mic pre into Input 2, run the line out of the power soak into Input 2. Bypass the cab block in the grid. Now, instead of playing, turn on the Synth block and use the pink noise to obtain the match. Be sure to capture the reference and local simultaneously, i.e. press X and then Y, then wait 10 seconds or so and press Enter. Pink noise will typically give a better match than playing but not always. When you play the interaction of the guitar with the speakers is captured as well which can sometimes give a better result.

Tone Matching: Mode parameter

  • When set to “Offline” the algorithm is optimized for non-real-time matching, i.e. matching a recording. When set to “Live” the algorithm is optimized for matching a live source such as an amp. Note that the Live mode can also be used for matching recordings and, in some cases, may achieve better results than Offline mode.
  • Cliff: "There are two ways to use the Tone Match function: Offline and Live. Offline allows you to match the sound of a recording. You capture the reference, then you capture your amp/cab models and the Tone Match block creates an IR that matches the amp/cab to the sound of the recording. The Live mode allows you to match an amp model to a real amp. It cleans up any differences between the model and the amp. In this mode you capture the reference and the amp at the same time (being sure to set the Mode switch to Live). It works astonishingly well. Live mode does not do gain matching however so you have to do that manually. The other caveat is that you have to manually select the closest model (competing devices auto-select the closest model). So, for example, if you wanted to Tone Match, say, a Metropoulos amp you would have to understand that this amp is a Plexi derivative and select one of the Plexi models as a base model and manually set the gain to be equal to the amp being matched. With all the models available in the Axe-Fx now some people will naturally feel the feature is less valuable than others. Personally I don't find any use for matching recordings as recorded guitar sounds are so heavily processed they aren't fun to play. I do, however, use Live mode quite often but mostly during the development phase of new models. It's an invaluable tool in that regard." Source

Tone Matching: Ref Solo parameter

  • When set to “ON”, the reference source is sent directly to the block output. This allows easily switching between the reference source and the matched signal for comparison. It is recommended to connect an external controller (i.e. footswitch) to this for ease in switching between the signal sources. NOTE: when Ref Solo is active the Layout menu will flash a message so that you know when you are listening to the reference source.

Tone Matching: IRs

  • The sampled data in the Tone Match block can be converted into an IR for sharing.
  • You can integrate an IR in a preset by replacing the Cab block with a Tone Match block, after having captured the tone of the Cab block. Here's how.

Tone Matching: how to interpret the Tone Match diagram

  • Cliff: "IIRC each dot is 2 dB giving a range of 40 dB (+/- 20 dB). There are two pixels between each dot. So each pixel would be 2/3 dB." Source
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