I'm not sure what number of lines of code would tell you.
We know
the company has been in business since 1987. At various times we even learn the number of employees.
CTO
Noel Borthwick, who joined Cakewalk in 1999, talks about the application...
http://www.noelborthwick.com/bio/index.php In
this video from 2007, Noel and Carl Jacobson talk about modifying for multicore and x64 for Vista and Sonar 6.0 and adjustments for Least Privilege adjustments (not running as admin). The also talk about Windows Error Reporting and crash dumps. Noel talks about potentially changing their methods for instrumentation and methods for understanding why customers crash and how to convert that to actionable data.
Remember the production compilation may not include all the assertions and tests that are part of the code base. In other words, lots of instrumentation will be left out, so the size of the shipped code doesn't fairly represent all the code in the project.
Noel: "When you are writing something for a cause that you believe in, it makes a big difference."