diff --git a/rust/pm-kit/src/main.rs b/rust/pm-kit/src/main.rs
index 3bdd3c7..8cbaec0 100644
--- a/rust/pm-kit/src/main.rs
+++ b/rust/pm-kit/src/main.rs
@@ -59,7 +59,7 @@ fn main() -> ! {
     // heap for track parsing (track-format uses alloc). RP2350 has 520 KB SRAM.
     {
         use core::mem::MaybeUninit;
-        const HEAP_SIZE: usize = 96 * 1024;
+        const HEAP_SIZE: usize = 16 * 1024;
         static mut HEAP_MEM: [MaybeUninit<u8>; HEAP_SIZE] = [MaybeUninit::uninit(); HEAP_SIZE];
         unsafe { HEAP.init(core::ptr::addr_of_mut!(HEAP_MEM) as usize, HEAP_SIZE) }
     }
@@ -155,7 +155,7 @@ fn main() -> ! {
     // confirmed-working pattern in a loop. No inputs/audio/clock. If the screen shows blue +
     // corners → heap + parse + display are all fine and the bug is in the metronome loop logic.
     // If still black → the heap/parse path breaks the display.
-    let _t = track_format::parse("t120;kick:4=Xxxx;snare:4=.X.X");
+    // (parse removed for this test — heap init only)
     let mut hb = false;
     let mut hb_us = 0u64;
     led.set_low().unwrap();