much progress, descriptors and sample rates getting basically working?

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -24,6 +30,15 @@ dependencies = [
  "embedded-io",
 ]
 
+[[package]]
+name = "defmt"
+version = "0.3.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0963443817029b2024136fc4dd07a5107eb8f977eaf18fcd1fdeb11306b64ad"
+dependencies = [
+ "defmt 1.0.1",
+]
+
 [[package]]
 name = "defmt"
 version = "1.0.1"
@@ -102,6 +117,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "portable-atomic"
 version = "1.13.1"
@@ -203,6 +227,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98816b1accafbb09085168b90f27e93d790b4bfa19d883466b5e53315b5f06a6"
 dependencies = [
+ "defmt 0.3.100",
  "heapless",
  "portable-atomic",
 ]
@@ -212,8 +237,9 @@ name = "usbd-uac2"
 version = "0.1.0"
 dependencies = [
  "byteorder-embedded-io",
- "defmt",
+ "defmt 1.0.1",
  "embedded-io",
  "modular-bitfield",
+ "num-traits",
  "usb-device",
 ]