The screen on the unit is not designed to show a little triangle on the current cue position, but if you want to see it, it appears on remotebox.
Auto Cue can be enabled only from the unit, but not from the Auto Cue option in My Settings of rekordbox.
XDJ-R1 can remember the setting once you enable the Auto Cue, so it would not be so much bother.
Regarding the first issue about the noise, another engineer is now investigating it.
If you turn off AUX or MIC, any change in the noise? -> We recommend AUX and MIC to be turned off when you do not use them.
When selecting DECK or PHONE/LINE, any change in the noise? -> We recommend to select PHONE/LINE only when other device is connected.
Do you use any conversion cables like XLR, RCA or TRS? -> We recommend not to use any conversion connector/cable.
Although he said “all the faders and volumes are down”,
Any change is observed when turning the knobs of MASTER LEVEL Vol or BOOTH OUT Vol?
Any change is observed when a CD is inserted or not?
Did you choose MASTER OUT 1, MASTER OUT 2 or BOOTH OUT?
Did you connect XDJ-R1 and the speaker to other devices such as PC or other DJ devices?
Do you have other device such as mixer, amp or effector in between XDJ-R1 and the speaker?
What is the model number of KRK speaker?