Problem running oram 2502.1 with RPI4, no kit with USB audio

Using Zynthian
1

Hi all, I’m using a very bare system as in the title - this used to work fine with older images but I can’t get it to work with the new image. It boots up fine but fails when I try to add an audio chain (appears to be because an index is wrong). If I use a dummy audio card it adds the chain OK. The USB audio adapter is a C-Media (1 input, 2 outputs) and I’ve selected the correct card number. Also, I have the hotplug disabled.

Display shows:
Failed to create chain

UI_log shows:
WARNING:zynthian_chain_manager.add_chain: list index out of range

Can I ask if anyone has tried any similar USB sound device? Anyone got any ideas what might be wrong.

Many thanks
Chris

2

Does it hang up and need rebooting as it tries to load a processor?

3

On the first attempt to add the chain it just fails with the message. If I try to add it again it hangs so I need to reboot.

4

It’s happened on two of my machines so far on Vangelis. Cured it by backing up, building a new ssd and restoring.

5

mmm, OK thanks. I’m currently using the stable image but I could try vangelis. I was wondering whether it’s something to do with the single (mono) input an maybe expecting stereo? Or maybe something changed when the hotplug USB code was added (pure speculation).

Thanks for your quick response.

6

I tried burning the image to a different SD card and also updating to Vangelis but these both behaved in the same way.

7

Ah ok.

I’m having a lock up problem with JV/3Band EQ & Dragonfly Reverb. Have you tried loading different processors? I just loaded a delay successfully onto the chain that has now hung. . . .

There is something in some processors that seem to trip it up.

I’ll report it.

It’s a pretty muddled error report so if you could add anything to it that would help .

I expect to be rudely told it’s all my fault very shortly. . . .

…Again.

8

…I tried 2 or 3 but they were all delay type functions. I’ll go back and try adding some other non-delay type functions. Maybe there’s something more in the debug log for my case - the standard ui log just showed an index out of range when doing an add chain. If I find anything I’ll post it.

I’m still finding my way around Zynthian so it wouldn’t surprise me if I’ve done something I shouldn’t have! :slight_smile:

9

I tried adding other non-delay effects chains and it (Vangelis) behaves in a similar way. The only concerning message I see in the ui log is the warning I pasted in my original post. However, I didn’t reflash the image after the initial failure, I just rebooted.

10

Hi, I decided to have a look at the code and the changes between the version that was working for me and the latest one. I came across some changes in zynthian_ui.py relating to the input capture ports. If I change these back then I don’t appear to get the problem. i.e.

code from 2502.1 (this fails for me)

    input_ports = zynautoconnect.get_audio_capture_ports()
    for i in range(0, len(self.audio_in), 2):
        a = self.audio_in[i]
        if a > len(input_ports):
            continue
        if i < len(self.audio_in) - 1:
            b = self.audio_in[i + 1]
            sources.append(f"^{input_ports[a-1].name}$|^{input_ports[b-1].name}$")
        else:
            sources.append(f"^{input_ports[a-1].name}$")

code from 2409.5 (this appears to work)

    for i in range(0, len(self.audio_in), 2):
        a = self.audio_in[i]

        if i < len(self.audio_in) - 1:
            b = self.audio_in[i + 1]
            sources.append(f"system:capture_({a}|{b})$")
        else:
            sources.append(f"system:capture_({a})$")

Now, I’m sure this isn’t a proper fix and I’m guessing it will break something that really needs those changes but maybe it is a clue as to what needs to be done.

Anyone, got any thoughts?