The reason to write here is to ask Edgar or someone else to explain the reason of the settings described in para 6.1, 6.2 and 6.3 of the guide and perhaps if they may suggest the same for RPi 4.
Yes, these are a must. This is all covered in README_LINUX.txt -- here is an excerpt (copyrighted by correct owners, of course) -- see the full file for more:
* make sure your user account is allowed to request real-time scheduling. This is mandatory if you
want a decent latency without tons of cracklings.
In order to elevate your account priviledges w.r.t. real time scheduling, you will need to edit
the /etc/security/limits.conf (as root or with sudo) file and add:
@audio - rtprio 90
@audio - nice -10
@audio - memlock 500000
You may want to tune the numerical values, but the most important is to grant realtime priviledges
to your account. If your user account is not member of the "audio" group, either join it, or
replace the "@audio" above by "@youruseraccount". After editing /etc/security/limits.conf, you must
log out and log in again in order to have the changes applied.
* you will probably want to turn off CPU frequency throttling when pianoteq is running, especially
if you CPU is not very powerful. You can use the "cpufreq-info" command-line program to checks
its current settings. CPU throttling can be disabled by the command:
sudo cpufreq-set -c 0 -g performance (disable on the first cpu core)
sudo cpufreq-set -c 1 -g performance (disable on the second core)
... (repeat for each CPU core)
## Pianoteq on ARM boards such as the Raspberry Pi 3
With version 6, Pianoteq is now able to run (with some performance limitations) on ARM boards, such
as for example the Raspberry Pi 3. Due to the limited cpu power available, a lot of care has to be
taken in order to achieve low latency without pops and cracks:
* the user account used to run Pianoteq *must* have real-time rights (see the tip above about
/etc/security/limits.conf ).
* the cpu frequency should be locked at its maximum frequency. On a raspberry pi 3, which max out
at 1.2GHz, it is:
sudo cpufreq-set -f 1200MHz
* the ethernet driver (at least as it is configured by default on Raspbian) will cause pops and
cracks when there is network activity so you really have to add the following option to
/boot/cmdline.txt:
smsc95xx.turbo_mode=NThe reason to write here is to ask Edgar or someone else to explain the reason of the settings described in para 6.1, 6.2 and 6.3 of the guide and perhaps if they may suggest the same for RPi 4.
Thanks everyone for your great job, Pianoteq obtained another fan.
]]>Thanks everyone !
]]>https://www.isticktoit.net/?p=1383
which outlines in great detail how to install the Linux USB gadget. There are many way to provide for a MIDI interface but this approach proved fairly easy and very useful. Other USB devices can be attached via the USB gadget other than MIDI but I have not explored them. If you find a need for USB MIDI, I strongly suggest you give this approach a try.
]]>Thank you!
Is it useful to take the 4GB ram version?
What do you mean by very very poor? Is it possible to play piano pieces? If not, do you know other devices, better than raspberry pi, to run pianoteq like it was integrated to the keyboard?
Thank you
Very poor means that any piece with some bass notes and pedal will cause the CPU to overload, by the way I think that setting polyphony to a low number is not an acceptable compromise.
EDIT: performance is improved if you run Pianoteq without the X-windows graphical user interface, I would not use the RPi for other task, so 1Gb version should be more than enough
]]>I use a Raspi 4 with 4GB, a 1024x768 small touchscreen and an external DAC.
Overclocking (https://www.tomshardware.com/reviews/ra...,6188.html) without a fan.
48Khz, 128 samples, polyphony 48. The CPU load is about 50%. top (terminal) say 3.2GB free memory!
Rainer
Thank you!
Is it useful to take the 4GB ram version?
What do you mean by very very poor? Is it possible to play piano pieces? If not, do you know other devices, better than raspberry pi, to run pianoteq like it was integrated to the keyboard?
Thank you
Is it useful to take the 4GB ram version?
What do you mean by very very poor? Is it possible to play piano pieces? If not, do you know other devices, better than raspberry pi, to run pianoteq like it was integrated to the keyboard?
Thank you
]]>I was just wondering if I had to buy the raspberry pi 4, now that it has been announced, or is it useless?
Even if I just follow the pdf, the suptronics x400 seems to be out of stock for now, is there an alternative?
Thank you very much!
]]>Hmm. I'm seeing the lightning bolt symbol a lot on the desktop, which apparently means undervoltage (with two different power supplies, one rated at 5v,3a, the other even higher). Might that be the reason?
That's strange and can certainly be the cause of your problem.
Do you have a high quality power cord?
Raspberry is very picky regarding power...