I sent three bug reports (two by E-mail and one by form on the TempoTec's website). I didn't get any response, so I want to publish the report here.
I apologize for my very bad English.
"<...>
I have the latest 1.0 firmware and it generally works fine.
Unfortunately there are some annoying issues I had using this DAP with 1.0 firmware.
- If V3 is connected to smartphone as BT receiver (with any BT codec), the music is stopped, and I trying to power off the V3, so it cannot to power off but it goes to reboot cycle. If I tried to hold power off button until it powered off, the next boot starts from initial setup with language choosing menu and the system settings are resetted.
I also noticed a bug in working with the KZ AZ20 earhooks - if Bluetooth is turned on boot, then opening the case with the earhooks KZ AZ20, connecting the earhooks to the player does not occur correctly - the SBC icon is displayed, and an attempt to start playback does not lead to anything. But if I then turn off Bluetooth on the V3 and turn it on again, the re-connection occurs with the correct aptX codec, then an error occurs on the first track, and the next one plays without any problems. At the same time, there are no problems at all with the KZ AZ09Pro earhooks, they always connect immediately and under any conditions with aptX, and immediately begin playback without errors. With the HiBy WU1 Bluetooth neckband there is no any problems with choosing codecs.
- Sometimes after trying to play the music file with unsupported format, V3 stuck on COAX mode and cannot play next supported track then, until reboot.
- During playing Qobuz any song, and using the seek position to track (to forward on some position on track) the song goes to full volume on very short time then goes to normal volume. It dangerous for hearing and sensitive balanced armature IEM.
- The changing sound volume can stuck and continue goes itself to full volume sometimes.
- With using HiBy Link connection, V3 can spontaneously goes to reboot.
- The Tidal app cannot get the latest Tidal feature 'HiRes FLAC support' with MAX quality.
- The feature "maximum digital volume output" does not change volume to maximum but just blocks volume changing.
- (not important, just notice) With using HiBy FC6 USB DAC, V3 makes MQA unfold itself and not on FC6.
Can I also request a few new features for better experience and sound tuning?
It would be great to have the following features:
- add the ability to use two AK4493SEQ digital filter for DSD. With firmware 1.0 you have added only six PCM digital filters and I really thankful for that feature.
- it would be great if you add the ability to choose "Sound Quality Adjustment Function" in accordance page 59 on AK4493SEQ datasheet. It will allow to users to tune sound color like in Zishan DSD that has this feature.
- Can you add the battery percentage status for connected Bluetooth TWS modules like KZ AZ20 and HiBy WU1?
I previously tried to get the TWS battery charge status from console command line on HiBy R3Pro DAP with similar HiBy OS platform and it can be used on V3 also.
gatttool binary file is presented in firmware. I use the command:
Code:
gatttool -b <MAC_address_TWS> --char-read --uuid=0x2A19 | awk '{print $4}'
then convert value from HEX to DEC.
Then the value is also needs to show on top bar user interface but that requires to modify main application and I cannot do that without source codes.
I also noticed that V3 cannot support to play 32bit FLAC and 32bit WavPack Audio Format (*.wv).
It can shows 24bit *.wv files in file list though but cannot play them. I also tried these 32bit PCM test files from the resource <link>
But it can play usual WAV 32bit/32bit float though.
Another issue, V3 cannot play the specific SACD in ISO. I tried this SACD from <link> , V3 reads the track list from ISO but cannot play any track on the list and shows error messages.
Can you exclude the file /usr/resource/dac_out_more_than_384k_fail from firmware to support 705kHz and 786kHz output to external USB DAC?
Without that file, I can play 705kHz and 786kHz FLAC with output to USB DAC FoxLess DA1.
Can you also exclude the file /usr/resource/bt_more_than_192k_fail from the firmware to support to play >192kHz PCM with Bluetooth?
There is no issues to play the files without that limit.
Sincerely, <...>"