Okay, I setup the DT, DN, and NDLR according to your instructions and that got me going. Thank you. 
Here’s what is not working 
- Motif 1 & 2 on the NDLR are triggering midi channel 1 on the DT. I don’t know why. I know this because when I press play on either motif 1 or 2, the midi channel 1 on the DT lights up, but not on midi channel 2 for motif 2.
- Pad on the NDLR doesn’t trigger. When I turn off the other NDLR channels I cannot get the Pad to trigger. I don’t know why.
What is working 
- Pressing play on the DT starts the clock and sequence going on the DN and the NDLR (provided I’ve pressed play on all the NDLR parts)
- When I press channel 1-4 on DT (midi chnls) the correct sounds are played through the DN.
Here’s my midi configuration
MIDI Configuration
NDLR Out A > Digitakt MIDI In
Digitakt MIDI Out > Digitone MIDI In
Digitone MIDI Thru > NDLR MIDI In B
NDLR Settings
MIDI channels 1-4 for NDLR parts
MIDI Out: All Channels
Clk in: 24 PPQ
Clk out: 1 PPQ
ClkDivOut: 1:1
Clock in: midi B
DT Settings
Sync
Clock, transport, prog sends: on
Clock, transport receive: off
Prog ch receive: on
Ports
Factory
Receive notes and cc/nrpn: on
Channels
Factory, Track 1-8 = midi channels 1-8.
Fx control: 9
Auto channel: 10
Program chg in ch: auto
Program chg out ch: auto
DN Settings
Sync
Clock, transport, prgm ch sends: off
Clock, transport, prgm ch receive: on
Ports
Factory
Receive notes and cc/nrpn: on
Channels
Factory,
Track 1-4 = midi channels 1-4
MIDI 1-4 = midi channels 5-8
Fx control: 9
Auto channel: 10
Program chg in ch: auto
Program chg out ch: auto
Multi map ch: off
Also, I don’t want to turn off my DT and DN because the midi configuration and settings aren’t saved. I’ve read several posts about how to save them but none are geared toward newbies to Elektron devices and assume prior knowledge. Also, the manual isn’t much help in this regard. I’m a bit slow with hardware so I’m probably not doing something simple right. 
I feel like I’m close but not quite there yet.
Thanks for your help.
Hionhifi