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Make sure the DAW is running in ASIO driver mode. Make sure the ASIO driver is set to the smallest usable buffer To see if the Plug-in Delay Compensation is a problem, bypass all effects using the FX button in the Mix Module.

The Focusrite ASIO driver should outperform WASAPI Shared. In ASIO mode try adjusting the Buffer Size slider (I believe Focusrite supports buffer size change from the DAW).

It does not matter how the MIDI data gets to the DAW, the audio from the soft synths return to the interface just like the audio from a mic or guitar when monitoring through the DAW. To hear the synth audio while playing make sure the instrument/MIDI track has input echo enabled.

Bounce to tracks is a track level audio operation my guess is you meant Bounce to Clips.

The last working version for PC modules is Softube v2.4.83 (from Jan 2019) Any release after that crashes the DAW. Using newer releases as regular plug-ins (the VST2 format pulls double duty as PC modules and standard plug-ins) works OK.

Try the new installer

Yeah, the ability to run multiple devices is not something manufacturers keep secret. If their devices are designed to run together, it will be documented and included in their marketing material. The opposite is not true. IOW, don't expect manufacturers to go out of their way to document their devices are not designed to run together or see that as a bullet point in their marking material.

Keyboard latency has nothing to do with MIDI. The delay is all on the audio side of things. To save some typing here is a recent post I made on the subject of audio latency

Different interface same discussion The bottom line is if interfaces can be aggregated, the hardware documentation will cover how to do it. It takes a specially designed ASIO driver (ideally although other driver modes may work) and a way to sync the devices to the same clock. This is something hardware vendors who support the feature document. Any audio or MIDI interface changes will likely require adjusting projects to suit the new hardware.

The feature is described here along with the appropriate setting in preferences Also the was a bug affecting this feature in 2021.04 that was fixed in 2021.06 From the Bug Fixes section of https://discuss.cakewalk.com/index.php?/topic/31279-current-release-202106-update-1-updated-13-jul-2021/&tab=comments#comment-253329

may be related to

yes both Poise and Grace are free

Are there any entries in HKEY_LOCAL_MACHINE\SOFTWARE\ASIO If so, what are they

Each DAW has its own Cakewalk Content, Program, ProgramData and User folders area in the registry (except for a couple of shared entries) They all use the same "Shared" folders containing DX plug-ins, PC modules and utilities such as the control surface dlls, program manager and scanner. The shared bits are the reason why all Cakewalk DAWs and CbB must be installed on the same drive and CbB must be installed last.

Yes, in order to use content bundled with SONAR Platinum, it must be installed prior to installing CbB. If you don't plan on using any of the old Cakewalk content, skip installing Platinum. If you have older Cakewalk plug-ins here is more info about installing Cakewalk products Here is the list of plug-ins bundled with CbB http://www.cakewalk.com/Documentation?product=Cakewalk&language=3&help=Plug-ins.1.html Here is the list of plug-ins bundled with SONAR Platinum http://www.cakewalk.com/Documentation?product=SONAR&language=3&help=Plug-ins.1.html SONAR also included audio and MIDI loops not in CbB.

There are two Cakewalk plug-ins commonly called LP EQ The L-Phase Equalizer and the LP-64 EQ

If the EQ is the L-Phase EQ from Cakewalk make sure it is activated. Click on the name of the plug-in in the lower right of the plug-in UI. Auth Mode should be Unlocked

BandLab (the company) offers two DAWs BandLab - a web based DAW Cakewalk by BandLab - the successor to SONAR

CbB was created from SONAR Platinum code. Since that time the DAW has received numerous fixes and enhancements. CbB does not include many of the plug-ins and other content bundled with SONAR Platinum, however; it will take advantage of the plug-ins and content bundled with any 64bit versions of SONAR installed on the PC.

To be clear, content bundled with SONAR Platinum is not included with CbB but features and bug fixes added after X3 are part of the DAW.

Yes, perform a full install of SONAR X3, apply the patches to it then install CbB.