diff --git a/main.cpp b/main.cpp
index f1ab8d5..68a428a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1827,6 +1827,9 @@ int run(const Config& cfg) {
 
             const uint32_t din_value = pending_din.front();
             pending_din.pop_front();
+            // Keep ADC logical-channel phase aligned even when samples are skipped outside packet windows.
+            const uint32_t lch = next_lch;
+            next_lch = (next_lch + 1U) % cfg.channel_count;
 
             const bool di1_level = (din_value & kE502Digital1Mask) != 0U;
             bool di1_changed = false;
@@ -1893,9 +1896,6 @@ int run(const Config& cfg) {
                 tty_group_state.clear_step();
             }
 
-            const uint32_t lch = next_lch;
-            next_lch = (next_lch + 1U) % cfg.channel_count;
-
             if (!fast_tty_avg_stream_mode &&
                 (cfg.di1_mode == Di1Mode::Trace) &&
                 ((cfg.channel_count <= 1U) || (lch == 0U))) {