Ask Justin Frankel

justin = { main feed , music , code , askjf , pubkey };

Ask Justin Frankel
No reasonable question unanswered since 2009!

Suggested topics: programming, music, sleep, coffee, etc.

Note: please do not ask questions about REAPER features, bugs or scheduling, use the forums instead.

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[older questions]

Question: I m not jk, I came in peace and one of the devices I used was without SIM.you should really see some of my accomplishments. Here can t send screenshots. Also I hold the email of your changing colors animal skin.wink wink.noise is not me btw..and the email I had since forever. I have some stuff to show you and not the time to search for an easier com. As I said before, you re one of the only tech ppl I like hahaha. Also there s less than 10 years difference between us, not gonna call you sir now hahaha
Asked by Brk_ (90.167.86.x) on September 23 2025, 2:52pm

Question: Hi, this is supposed to be a simple playback counter, but only the first playback gets detected and updated to 1 but then gets stuck at 1 even when we've stopped and played back multiple times. Could it be that the built-in playstate is sending wrong values? I'm struggling to find whats wrong. pastebin.com/z2DbtZJa
Asked by debug (102.176.65.x) on September 22 2025, 9:22pm
Reply on September 22 2025, 10:23pm:

by default in JSFX, everything (all memory, variables, etc) get reset to 0 and @init gets called on each playback start. you can disable this behavior by setting ext_noinit=1 in @init. 1 Comment...

Question: There's chessboxing, you probably know. How about codeboxing? lol
Asked by wasereb4 (95.90.179.x) on September 21 2025, 9:31pm
Reply on September 22 2025, 1:25am:

sounds painful Comment...

Question: Hello! It seems there is no official standard for embedding cover art images (jpeg) into broadcast wave file metadata. That said, embedding the image in an ID3v2 tag works well and shows up in many programs, like VLC. I have found that software that doesn’t support ID3 tags simply skips the image without any issues. What do you think about this solution?
Asked by MS_from_Sweden (82.100.127.x) on September 21 2025, 3:12pm
Reply on September 21 2025, 5:22pm:

Hey whatever works, we support it in REAPER too Comment...

Question: Hi, pls is there JSFX plugin you implemented oversampling in. I wanted to take a look at how you did it, or perhaps if you could just list the steps as to how you did it natively in REAPER because that works perfectly?
Asked by Hello (197.251.240.x) on September 19 2025, 1:10pm
Reply on September 19 2025, 2:55pm:

there have been but it is totally crap and not really useful. we do it in reaper by using our built-in SRC algorithms (which are a bit much for JSFX to implement). 4 Comments...

Question: Hadn't realised we're so old already :) Happy 20th anniversary! Are you going to celebrate with the team/alumni?
Asked by SpoiledHobo (147.161.164.x) on September 19 2025, 2:55am
Reply on September 19 2025, 2:55pm:

Virtually and symbolically, maybe? Comment...

Question: Hello Justin I am trying to use the WDL_fft to make a simple spectrum analyzer and I am confused about the use of WDL_fft_permute, I basically scaled the raw samples and passed it to the fft function calculated the magnitude of the output but it doesnt look right, I saw the comment about the WDL_fft_permute and I am wondering what is going on
Asked by fft_test (156.195.142.x) on September 18 2025, 7:41pm
Reply on September 19 2025, 2:44am:

the order of the output is special, it is not in-order and it is not bit-reverse ordered, it's the order defined by that function. and of course they are complex pairs. so if you do WDL_FFT_COMPLEX arr[1024]; then set ar[0].re to the first sample, ar[0].im to 0, etc, and fill 1024 samples (ideally windowed), then call WDL_fft(arr,1024,0), then ar[WDL_fft_permute(1024,0)] will be the DC vector (only the magnitude of that vector is significant), ar[WDL_fft_permute(1024,1)] will be the lowest frequency bin vector (take sqrt(re*re+im*im) for the magnitude),etc, then ar[WDL_fft_permute(1024,511)] will be the nyquist vector (only the magnitude of that vector will be significant). Comment...

Question: Hey, man, you did a great job with this JSFX environment bundled with REAPER. Tried digging some vsts and man the workflow is terrible. JSFX all the way, man.
Asked by Heey (102.176.101.x) on September 18 2025, 1:46pm
Reply on September 18 2025, 6:21pm:

glad you like it! I do too. Comment...