multiple if objects

Well, for starters, you didn't copy your patch in compressed format, yet somehow managed to encode it in your message as if it was compressed. Did you manually prepend and append the compression tag on uncompressed code? Either way, even after pasting the uncompressed part of your code inside of an existing Max window, it crashed Max. So.. as the very least, go back to your patch, select all, edit -> copy compressed, and paste that in a forum message window and resend.

This is the only if argument I could see in your code:

"if $i1 57) || ($i1 59) || ($i1 65) || ($i1 67) || ($i1 69) || ($i1 75) || ($i1 77) || ($i1 79) || ($i1 85) || ($i1 87) || ($i1 89 then A"

If that's what you wrote (and it's not an artifact of the above issue) then I think reading the reference documentation and looking at the help file more closely will help you.

What are you trying to express? How would you say it in natural language?

At the very least... parentheses need to be closed... and changeable args also need to have a functional relationship with the integers to which they are paired. ex. "($i1 > 57)" is valid condition. "($i1 > 57" is not valid becuase the parentheses are not closed. "($i1 57)" is also not valid because there is no function. And "A" is not a valid variable. Variables take the form of $i1 or $f1, etc. There are no a's or x's or n's in the syntax.

In terms of a complete expression, [if] statements go something like: "If some condition is met, then do something, otherwise do something else". A valid example would be "if ($i1 > 60) then 1 else 0" This will output a 1 if the integer sent to the left inlet is greater than 60 and a 0 if it is not.

If you want a letter as the result for meeting a numerical condition, you need to handle that after the output. You can use the select object to select a numerical input and bang a message box containing a letter to output your letter. ex. [if ($i1 >= 60) || ($i1 < 70) then 1 else 0] with [sel 0 1] connected to the outlet of the if object and a message box containing the letter "D" connected to the right outlet of the sel object. That way, if the input is 60 to 69 it will output a 1 and the sel object will bang out a D.

That said, unless you really need to two separate results sent out different outlets, I think the expr object is much more flexible and can pretty much do whatever the if object does... but you will need to get familiar with it. Good luck with your project.