Thank you for your reply.

1. L/ R balance = Output Balance.
   The SELECT button always active = always HOLD down. And right level meters show two bars, lit up until the yellow LEDs always.

   
   

2. Yes, TotalMix can be operated normally with the mouse, but adjusting the volume is not as quick and intuitive as the encoder. So I want to disable or bypass SELECT button.

   
   

3. Driver and Firmware all are the lastest version: 1270 & 321.

I personally think it's a hardware problem with the micro switch, even though I've pressed the SELECT button less than ten times in over a year. By the way, the Encoder fell out of the bag when I  unboxed this new one on the first day I, so I'm honestly not too surprised by the micro switch failure. But it's still not nice to come back from a cup of coffee and find that the button is failed.

Thanks a lot for suggestions.
If possible, I would like to disable / bypass the SELECT button through TotalMix first.
It is inconvenient to send it back to the dealer for repair in my area, and the dealer is difficult to contact and they will not respond to email technical support.

I am now concerned that the micro switches of other buttons may also have problems soon.

Thank you Mr. MC for your reply.

My device is probably out of warranty since the dealer seems to only offer a one-year warranty, so as long as there are no other hardware failures that affect music production, I will continue to use this device until I complete all my projects, just like my nickname: Not many days left for muisc.

Right meters are showing  two bars LEDs always.

That photo looks like the Select button is lower positioned  than when pressed, as if the PCB is broken inside...

I have some suggestion regarding efficient usage of DSP computing power. The Babyface Pro FS can calculate seven equalizers on the input channels and six on the output channels plus reverb and echo. Makes 15 effects in total. However the vast majority does not need all those effects since not all inputs or outputs are connected or they do not require the equalizer.

So I suggest a firmware and software upgrade that works with a DSP load model. Every equalizer takes 5% DSP load, reverb and echo 15%. So if a compressor/limiter effect would take 60% DSP load it would still fit as long as you don't need more than one equalizer.

Some claimed it's only about USB power limitations that there are not full effects. But there is an external 12 V input. RME could enable more DSP power if the 12 V is connected.

BBF Pro has no DSP inside. Thus no full implementation of FX (USB2 power not sufficient for that).

Therefore the situation is like Kubrak highlighted already:
- EQ calculated by the FPGA
- Reverb and Echo processed on PC
- No dynamic effects (compressor, limiter, noise gate)

RoomEQ and Crossfeed would have needed this separate DSP chip.

But even if a device has a DSP inside, it is no guarantee, that there are enough resources to implement RoomEQ and Crossfeed. This needed a review of RME. The outcome was, that for UCX II, 802 FS, UFX II/III, UFX+ it was possible.

But for the HDSPe MADI FX you need a never version of the card, otherwise also impossible.

We should be glad, that many good devices could get it as a firmware upgrade and this free of charge.

To 1 + 3, if you were more regular in this forum, then you would know it.

To 2, please have a look below ++)

To 4. The BBF Pro is missing a DSP for FX and RoomEQ/Crossfeed.
The power budget of USB2 won't allow this.

See my posting, it explained already everything to you, what you need to know
https://forum.rme-audio.de/viewtopic.ph … 42#p236542

++) Sorry, but you don't seem very familiar with RME products.

All RME devices are equipped with FPGAs which are flashable, so all aspects of potential errors on the device can be fully fixed. There is also no third-party communication chips that could bottleneck performance. The FPGA even does the USB communication. The drivers are outstanding: extremely stable with ultra-low latency.

Moreover, there's a DSP mixer with excellent features and a level of maturity that's practically unmatched in this class. The best DSP mixer on the market. RME has been consistently using TotalMix [FX] across all their products for over 25 years.

The manuals? Exceptionally well-structured and of a quality that's hard to find these days. Plus, RME includes a whole range of highly useful free software tools, like DIGICheck and the newer DIGICheck NG. Standalone audio analysis tools of this quality would easily cost around €400 on the open market. Not to forget TotalMix Remote for LAN-based control of TotalMix FX.

RME also offers an unusually long driver and firmware update service — for some products, continuing for over 20 years now.

Other highlights include:different reference levels, femtosecond quartz clocks, extremely fast converters.

A support team and user forum that actually understands the technical details and can provide real help.

I suspect you're comparing RME to typical consumer-grade products, which don't offer even a fraction of this functionality and whose product lifecycles usually max out at around five years.

In contrast to that, a well-maintained, not-too-old used RME interface can often still sell for around 70-80% of its current street price.

And now look at the price history of geizhals, prices went down again, no reason to complain:

Babyface Pro FS is worth much more than its price list. The software - TotalMix - alone is worth the list price. Babyface Pro FS is very reliable, works without fault, compatible with a wide range of devices, is versatile in terms of inputs & outputs.

Perhaps not everyone can afford it, but there are plenty devices with this characteristic.

In fact, I am puzzled, how can RME maintain the same price since 2019 (possibly earlier).

Babyface Pro FS ranks #11 in USB audio interfaces at Thomann. In my opinion, it speaks well about the price / feature / quality ratio. There must be some reason behind it.

Don't confuse DSP as a function (digital signal processing) with DSP as a device (digital signal processor). In that sense, FPGA can perform some signal processing, but the Babyface Pro lacks the dedicated digital signal processor chip found in higher-level RME interfaces. That's what Kubrak had in mind and that's how most of us understand it here; it's rather impolite to pick on words and make strawman arguments.

Such speculations are not based on actual facts of the matter.

This could be a valid opinion provided there were other interfaces with at least the same performance, feature set (or even with a full-featured DSP chip that you demand) and support level at lower price. But there are none.