I had this thought too. This happens regardless of the amount of audio loops/samples being played back/loaded. The loops I have posted have been recorded in an empty project on a power cycled unit as indicated in the steps in my first post.
The SD card that I am using is Sandisk Extreme Pro SDXC UHS-I card rated for 4K UHD video quality. To re-iterate, I do not see how the SD card is the problem in this case, given that the issue occurs when attempting to record the first 4 bar loop @ 120 bpm in the whole project without anything else in the project.
However, that 4K video rating does not tell you anything about how it performs in the 2400. The performance will depend more on access times than on bandwidth for one stream.
Every sample that is too large for memory will stream from the card. I don’t know how it is implemented, but Vlad spoke once about 2 audio streams for stereo samples… So, if you (worst case) use 8 long & sliced stereo samples and those slices are triggered often, you probably will have 16 streams constantly (re)loading from the card and you are writing at the same time to record it.
But that’s all theory. You are only recording an external synth, so it probably is not related to the SD card…
I have not yet had this problem with my current card. I will test it on my system (Sandisk Extreme Pro U3 - 170MB/s) and see if the latest firmware behaves differently. I have not used the livelooper in the lastest OS.
I followed your scenario, but with 1 difference:
Between step 2 and 3 I recorded one midi note on E1 with length of 3 measures. My synth sound release is a bit longer than 1 measure, so when recording the liveloop, sound is there for all 4 bars.
The sound is clear for the full liveloop of 4 measures and repeats perfect for the next 4 bars. So, I cannot reproduce it using the same firmware and almost the same SD card.
Have you checked the serial number on the card? I read on this forum that the fake ones miss that serial number…
Oh wow what a detailed response. Thank you for caring! I followed the instructions for verifying the authenticity of the card from sandisk website and mine seems legit. It totally has a serial on it, too.
I appreciate your effort, I really do but we shouldn’t be making assumptions unless we know something for sure. Our SD card conversation might be very misleading for the debugging process of a developer and we need to be very careful with the information we provide because system debugging can get insane too quickly. I suggest we sit and wait until the guys ask for more information.
I did look at your files. I can see and hear the extra sound. It seems like the same sound layered on top of itself.
However, we have not been able to reproduce this bug. So we still do not know what caused that to happen.
Today I used the live looper again and the issue happened to me. I came back to a project from a few months ago with the bpm of 137, 8 bar pattern. It had 6 loops committed as well as about 6 tracks of sequenced 707 drums on bank A. When I wanted to add loop 7 the issue started happening again. Fairly randomly but still incredibly frequently. (about 60% of times)
Below are examples demonstrating the issue (this time I used casio VL-tone as source plugged into input 3 on the S2400):