The English J has a D sound at first and then a deeper J sound afterward.
However, when vibrating it, you don't vibrate the D sound but only the J part afterward if that makes sense.
The French J as in Jacques can be felt almost only on your teeth.
The English J as in joke can be felt on your teeth and also alot more on your hard palate than the French one.
If you put your lips in the position they would have when making the O sound and then vibrate the French J it will naturally make the English J. ^-^
About the R sound:
French Canadians also use the french R.
I think the Italian R is the same as the Spanish and Japanese one.
The R & the K sound are the less convenient ones to me since if my head is tilted too much forward or backward, they are impossible to make.
I cannot vibrate them when laid down or if I am laying on my right side but on the left side it works. :p
The English R is a lot more guttural than the French one but it is the French one we use when vibrating the R as in RAUM. You simply extend it.
The R sound is the same sound you would make when trying to mimic a dog growling.
Since I have one and I always do this to "banter" her it's the first example that came to my mind. :lol:
Also when you gargle with let's say water after brushing your teeth. (I was doing this as a kid.)
I think you might be confusing the French R
with the English one when comparing it with the G sound for the pineal gland.
If you make the English R sound and then vibrate the Y sound at the same place you get the G sound (pineal) but the French R is not deep enough.
The sounds I struggled the most with was the CH sound in CHANDRAMASE which is the same sound as in ich in German & the Gothic g when in the middle of a word as in nacht in German.
Don't give up!
I know you'll master all these new consonants eventually. :D
I am also very glad I could help you! ^-^
(Someone please correct me if I'm wrong.)