Setting node title as view argument/path I'm creating a feed view that generates a specially-formatted file when nodes of a specific content type have /tsv appended to the path (generated by path_auto)

I.e.,


http://localhost/content/a-title/ --
node
http://localhost/content/a-title/tsv
-- feed view


How do I do this? I have node/%/tsv as the feed path, Node: Nid as argument (with "Node ID from URL" as the "Action to take if argument not present").

I feel there must be something really obvious I'm missing... Apologies if this has been covered before, I really did look for a solution before posting.

Thanks!
I'm not sure if I understood you question but I think the answer is:

In Arguments set Node: Nid as argument. Then set Provide Default argument and choose NODE ID from URL.

Here are all the steps.

You have 2 different views to your node. 


Normal view. URL-> mydomain.com/node/%nid/ shows your node content
Feed view. URL -> mydomain.com/node/%nid/tsv shows your feed.


But when you navigate to mydomain.com/node/%nid/tsv it does not work right? So what you're asking is how you "create" this URL in order to show the feed... is that it?

If that's the case, in VIEWS2:


Create a new PAGE display. 
In Page settings (bottom left corner) there's an option called PATH. Set this to node/%/tsv.
Still in Page Settings theres an option called menu. Set this to Menu Tab if you wish to show a tab linking to your view. | view  | TSV |
In Arguments set Node: Nid as argument. Then set Provide Default argument and choose NODE ID from URL. 
Validation set Basic Validation (or Node Type if the Feed is only available to certain node types)
In fields, select the fields you wish to show.
Add a filter to node published (to show only if the node is published) and a filter user role (to limit access to certain users)


And that's it... when you navigate to mydomain.com/node/%nid/tsv it shows the fields you selected.