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EDIT: You will find my "production" script for download and up-to-date instructions on this website: http://acousticir.free.fr/spip.php?article136&var_mode=calcul EDIT: Links fixed! Check out this AGF thread for Doug Young’s demo of my IR along with my too long technical description of how my IR is generated (not required reading!). You will need headphones to hear this level of detail. Doug has previously been published in Acoustic Guitar magazine. https://www.acousticguitarforum.com/forums/showthread.php?t=568631 Essentially my IR script replaces the Aura library or the Audio Sprockets ToneDexter training process with a custom IR you generate on your own. If you would like to use an HX Stomp, as I do, as your do-it-all acoustic guitar pedal, this script plugs the only missing capability in the HX's repertoire. Doug's evaluation was with a very high end Barbera pickup. The improvement of an IR is much more startling using a standard UST such as a Fishman Matrix, Fishman Sonitone, or Baggs Element. My guitar has a Schatten passive HFN soundboard transducer and these IRs even work nicely with that fairly natural sounding pickup. The Easy Way to Generate a Custom IR for Your Guitar: Email (firstname.lastname@example.org) me a Dropbox or Google Drive link to your recording. If your .WAV file is less than 25 MB it can be sent as an email attachment. If you Zip up your recordings you can include several in a less than 25 MB email attachment. Generating the IR takes only seconds in Matlab (longer in Octave). If you want, send a few recordings with different mic placements. I like 8” from the neck/body joint, but a more distant mic placement might make what is a better IR for your usage. .WAV file at least 60 seconds long Pickup left, Mic right, set your DAW for the two to be about equal in volume No clipping Try to keep your peaks within 15 dB of clipping (decent SNR) I like open position strumming followed by “E” bar chords going from F to C followed by a little fingerpicking. Play whatever you think best exhibits your playing style and instrument. I’m not sure it really matters. Doug Young’s recording was a fingerstyle tune with occasional strums. I won’t be listening to your recording so don’t worry about impressive playing :~). I will send you back three IRs for each recording. They will be at the same sample rate as the recording you sent me. The one labeled 5050 will be 50% bypass mixed with 50% IR. The IRs will be 2048 samples except for the one explicitly labeled 1024. The three most common errors users have encountered are: To forget to pan the pickup left and mic right when exporting the sample from their DAW. The sample WAV file is less than 60 seconds. If running the script themselves (see next section) they forget to enclose the name of the wave file in single quotes, or include the extension instead of just the wave file name. The Do It Yourself Way: Download the free GNU math development environment Octave and follow the installation instructions for your PC (they support Linux, Windows 64, Widows 32, and Berkeley Unix). https://www.gnu.org/software/octave/download.html Download the Octave version of my IR generator (also attached to this post and downloadable if you log-in to this website): https://drive.google.com/open?id=1PtZmcDGo5yXbwjmHJGkhCX3uRyJDuRP- Place your guitar pickup/mic recordings in the same directory as my script jf45ir.m and double clip (run) jf45ir.m. The GUI version of Octave will open in that directory. Alternately, after installing Octave, run the GUI version and change the current directory to the one in which you placed my script and your recordings. If your recording is called mgit.wav, for example, then type the following in the Octave command window followed by a carriage return (don’t forget to include the single quotes before and after the file name and don’t include the ".wav" extension) : jf45ir('mgit') Octave will then generate four files, three IRs plus a frequency plot of the 100% IR. jf45irmgit.wav jf45ir5050mgit.wav jf45ir1024.wav FFTjf45irmgit.jpg Let me know how you make out with the IR. To my mind it is a pretty brute force implementation right out of a textbook, but it seems to produce useful results. The 1024 sample IR should be adequate for most instruments, but the longer version gives the IR better control over the low-E fundamental. I have put this script into the public domain as I think it adds important capability to a multi effects setup for use with an acoustic guitar. Most acoustic guitar solutions are hardwired feature sets including the few that implement IRs. Thanks, Jon jf45ir.m
I saw recently that Robbie Calvo has become a Helix enthusiast. That's great, because he's not only a great guitar player, but a great instructor. I've followed several of his guitar technique training videos on Truefire.com and I thought it would be pretty great if he were to do an in-depth training course on the Helix. Now Truefire.com is focused on guitar/bass instruction, but they did have one of their instructors do a module on how to make the most out of loopers, so some hardware training wouldn't be that much of a stretch for them. Since Robbie's already one of their popular instructors and since he's now become a Helix enthusiast it seems like a match made in heaven. But how can I make this suggestion to Line 6? All the contact information on this site is focused on support or artist partnerships. Truefire.com wrote me to say hardware-based training would normally be initiated by the manufacturer and to suggest it to them. Any ideas anyone? Thanks.